These are metadata fields that UA has at times included with the metadata. Except for the last one in the list, this is a subset of what was found in the PDFs (pdfinfo) plus what may have been provided in a spreadsheet, and possibly with some renaming to align the PDF metadata with the data in the Doc17k collection.
Doc10
Set(personalAuthor_en, corporateAuthor_en, Famine Early Warning Systems Network (FEWS NET), title, Keywords, creation date)
Doc52
Set(publicationDate, personalAuthor_en, series_en, corporateAuthor_en, title, Keywords, creation date, vroy@fews.net)
Doc350
Set(title, publisherName, creation date)
Doc500
Set(title, publisherName, creation date)
Doc17k - these come not from PDFs but from a database
Set(accessRights, DraftPages, localizedTranslationURL_ms, _dlc_DocIdItemGuid, AG, TitleNumbering, agrovoc_es, Author, defaultTranslationURL_cs, seriesName_ru, localizedTranslationURL_cs, division_es, series_id, defaultTranslationURL_ne, defaultTranslationURL_mg, gsaentity_google_type, thumb100, localizedTranslationURL_mg, region_zh, personalAuthor_es, Minor Version, RESPONSE_SENDER_NAME, localizedTranslationURL_de, session, GTS_PDFXConformance, ShareDoc, MAIL_MSG_ID1, department_zh, localizedCardURL, _EmailSubject, defaultTranslationURL_ko, defaultTranslationURL_zh, localizedTranslationURL_ko, Language, localizedTranslationURL_zh, defaultTranslationURL_fj, Maintained by, defaultTranslationURL_so, region_ru, ParagraphNumberingLegal, jobNumber, localizedTranslationURL_so, Major Version, localizedTranslationURL_to, docRepCollection, author_id, KeyWords, Title, localizedTranslationURL_hy, defaultTranslationURL_ta, defaultTranslationURL_sk, region_en, defaultTranslationURL_ba, seriesName_es, Subject, localizedTranslationURL_sm, localizedTranslationURL_ca, docType_en, defaultTranslationURL_ka, country_es, localizedTranslationURL_ka, agrovoc_id, defaultTranslationURL_ur, meeting_ru, localizedTranslationURL_ur, MTEquationSection, issn, Universal PDF, 213, localizedTranslationURL_mn, defaultTranslationURL_hi, corporateAuthor_id, Description, agrovoc_en, GTS_PDFXVersion, defaultTranslationURL_sr, department_ar, division_en, RapportAuteur, sharepoint_id, defaultTranslationURL_ar, thumb200, _PreviousAdHocReviewCycleID, pages, FilePreviewStatus, MAIL_MSG_ID2, series_ar, robots, division, defaultTranslationURL_ms, mobiUrl, series_es, AssocFileName, Last Modified, allLanguages, distribution, Version, _EmailStoreID, seriesName_id, ICNAppPlatform, defaultTranslationURL_sl, localizedTranslationURL_sl, localizedTranslationURL_rn, localizedTranslationURL_es, collection_ar, seriesDetail, note, Mendeley Citation Style_1, workUuid, country_ru, gsaentity_City, customTitle_es, AGA, seriesName_en, collection_es, ICNAppVersion, first_open, meeting_ar, SourceModified, defaultTranslationURL_dual, Symbol1, defaultTranslationURL_lo, country_en, region_id, localizedTranslationURL_ne, defaultTranslationURL_to, gsaentity_google_language, e-isbn, region_fr, gsaentity_file_type, UseDefaultLanguage, _DocHome, defaultTranslationURL_de, defaultTranslationURL_km, department_id, defaultTranslationURL_id, localizedTranslationURL_mk, PAA activities, PDFVersion, department_fr, Generator, localizedTranslationURL_dual, abstract_es, defaultTranslationURL_fr, defaultTranslationURL_sm, localizedTranslationURL_fr, defaultTranslationURL_et, cardURL, localizedTranslationURL_uk, Operator, corporateAuthor_ar, defaultTranslationURL_da, localizedTranslationURL_sw, localizedTranslationURL_da, customTitle_zh, localizedTranslationURL_et, sdg, title, Keywords, defaultTranslationURL_mt, DirectFormatting, DocumentToConvert, meeting_id, defaultTranslationURL_hy, Direction, division_fr, localizedTranslationURL_sk, localizedTranslationURL_ru, language, TransitPubID, docType_zh, author_en, defaultTranslationURL_hu, localizedTranslationURL_hu, gsaentity_google_lastmod, agrovoc_ru, collection_fr, ContentTypeId, edition, LinksUpToDate, localizedTranslationURL_en, division_ru, confNumber, abstract_zh, localizedTranslationURL_si, defaultTranslationURL_mn, _AdHocReviewCycleID, database_id, defaultLanguage, author, RapportTaalDocument, revision date, project name, _EmailEntryID, department_es, series, defaultTranslationURL_es, personalAuthor_en, defaultTranslationURL_sv, region_ar, country_id, HeaderDone, _AuthorEmailDisplayName, country_fr, _AuthorEmail, Trapped, defaultTranslationURL_th, docType_ar, PTEX.Fullbanner, Comments, DocType, defaultTranslationURL_no, localizedTranslationURL_no, DocSecurity, gsaentity_Country, abstract, agrovoc_ar, defaultTranslationURL_pt, localizedTranslationURL_pt, division_ar, gsaentity_Location, defaultTranslationURL_ky, localizedTranslationURL_lo, localizedTranslationURL_ky, RapportTitel, localizedTranslationURL_hr, series_zh, geoSelfGoverning, localizedTranslationURL_fa, Afdrukken, department_ru, ICNAppName, codeMantra, LLC, localizedTranslationURL_id, IniName, Your guide to the eatwellplate , localizedTranslationURL_vi, subtitle, series number, _ReviewCycleID, customTitle_fr, LastSaved, RapportDatum, defaultTranslationURL_ki, collection_zh, defaultTranslationURL_si, division_id, placeOfPublication, author_zh, description, meeting_zh, HyperlinksChanged, docType_id, series_en, Category, Docear4Word_StyleTitle, AuthoritativeDomain[2], docType_fr, customTitle_ru, Build, country_ar, collection_ru, defaultTranslationURL_el, keywords, localizedTranslationURL_is, localizedTranslationURL_el, defaultTranslationURL_te, localizedTranslationURL_te, Created, defaultTranslationURL_ml, sortpubdate, customTitle_en, agrovoc_zh, localizedTranslationURL_nl, GENERATOR, collection_en, localizedTranslationURL_ta, customTitle, isbn, CreationDate--Text, User, Division, corporateAuthor_zh, personalAuthor_zh, defaultTranslationURL_ja, ElsevierWebPDFSpecifications, gsaentity_country_content, defaultTranslationURL_he, abstract_ru, localizedTranslationURL_he, Translated, SjabloonVersieDatum, EcoNote, localizedTranslationURL_sv, uuid, defaultTranslationURL_it, localizedTranslationURL_it, Company, AppVersion, author_ar, abstract_en, region_es, Status, localizedTranslationURL_th, localizedTranslationURL_sr, doi, localizedTranslationURL_ar, WPS-JOURNALDOI, docType_es, seriesName_zh, geoNonSelfGoverning, defaultTranslationURL_fa, file_length, publisherName, OLV0_XMD_PAGE_COUNT, MTWinEqns, defaultTranslationURL_mk, otherEntitiesInvolved, CreatorVersion, defaultTranslationURL_vi, epubUrl, XPressPrivate, visibility, WPS-ARTICLEDOI, defaultTranslationURL_uk, meeting_es, defaultTranslationURL_sw, docType, personalAuthor_ar, series_fr, Creator, abstract_ar, defaultTranslationURL_ru, WkDocID, faoProject, defaultTranslationURL_pl, TaalDocument, publicationDate, localizedTranslationURL_pl, Prepared, defaultTranslationURL_is, e-issn, series_ru, collection_id, department_en, localizedTranslationURL_ki, MTEquationNumber2, corporateAuthor_es, defaultTranslationURL_sq, gsaentity_google_encoding, localizedTranslationURL_sq, defaultTranslationURL_nl, seriesName_ar, author_fr, docType_ru, meeting_fr, ScaleCrop, AuthoritativeDomain[1], division_zh, RapportVoettekst, localizedTranslationURL_km, _AssemblyLocation, _AssemblyName, defaultTranslationURL_ca, EMAIL_OWNER_ADDRESS, defaultTranslationURL_ro, gsaentity_doc_source, Base Target, localizedTranslationURL_ro, PXCViewerInfo, localizedTranslationURL_fj, WPS-PROCLEVEL, SOURCE, Type, localizedTranslationURL_mt, author_ru, defaultTranslationURL_lv, localizedTranslationURL_ml, localizedTranslationURL_lv, abstract_fr, agrovoc_fr, year, JobNo, cardText, LCID, meetingDocSymbol, localizedTranslationURL_ba, corporateAuthor_fr, meeting_en, personalAuthor_fr, Papiersoort, localizedTranslationURL_ja, homepage, defaultTranslationURL_tr, localizedTranslationURL_tr, creation date, database_en, gsaentity_file_type_content, project code, gsaentity_Date, ContentType, corporateAuthor_ru, localizedTranslationURL_hi, country_zh, publisher, personalAuthor_ru, author_es, defaultTranslationURL_hr, corporateAuthor_en, seriesName_fr, customTitle_ar, defaultTranslationURL_rn, Subjects, defaultTranslationURL_fi, localizedTranslationURL_fi, alternativeVersion, ADBE_ProducerDetails)
These are metadata fields that UA has at times included with the metadata. Except for the last one in the list, this is a subset of what was found in the PDFs (pdfinfo) plus what may have been provided in a spreadsheet, and possibly with some renaming to align the PDF metadata with the data in the Doc17k collection.
Doc10
Set(personalAuthor_en, corporateAuthor_en, Famine Early Warning Systems Network (FEWS NET), title, Keywords, creation date)
Doc52
Set(publicationDate, personalAuthor_en, series_en, corporateAuthor_en, title, Keywords, creation date, vroy@fews.net)
Doc350
Set(title, publisherName, creation date)
Doc500
Set(title, publisherName, creation date)
Doc17k - these come not from PDFs but from a database
Set(accessRights, DraftPages, localizedTranslationURL_ms, _dlc_DocIdItemGuid, AG, TitleNumbering, agrovoc_es, Author, defaultTranslationURL_cs, seriesName_ru, localizedTranslationURL_cs, division_es, series_id, defaultTranslationURL_ne, defaultTranslationURL_mg, gsaentity_google_type, thumb100, localizedTranslationURL_mg, region_zh, personalAuthor_es, Minor Version, RESPONSE_SENDER_NAME, localizedTranslationURL_de, session, GTS_PDFXConformance, ShareDoc, MAIL_MSG_ID1, department_zh, localizedCardURL, _EmailSubject, defaultTranslationURL_ko, defaultTranslationURL_zh, localizedTranslationURL_ko, Language, localizedTranslationURL_zh, defaultTranslationURL_fj, Maintained by, defaultTranslationURL_so, region_ru, ParagraphNumberingLegal, jobNumber, localizedTranslationURL_so, Major Version, localizedTranslationURL_to, docRepCollection, author_id, KeyWords, Title, localizedTranslationURL_hy, defaultTranslationURL_ta, defaultTranslationURL_sk, region_en, defaultTranslationURL_ba, seriesName_es, Subject, localizedTranslationURL_sm, localizedTranslationURL_ca, docType_en, defaultTranslationURL_ka, country_es, localizedTranslationURL_ka, agrovoc_id, defaultTranslationURL_ur, meeting_ru, localizedTranslationURL_ur, MTEquationSection, issn, Universal PDF, 213, localizedTranslationURL_mn, defaultTranslationURL_hi, corporateAuthor_id, Description, agrovoc_en, GTS_PDFXVersion, defaultTranslationURL_sr, department_ar, division_en, RapportAuteur, sharepoint_id, defaultTranslationURL_ar, thumb200, _PreviousAdHocReviewCycleID, pages, FilePreviewStatus, MAIL_MSG_ID2, series_ar, robots, division, defaultTranslationURL_ms, mobiUrl, series_es, AssocFileName, Last Modified, allLanguages, distribution, Version, _EmailStoreID, seriesName_id, ICNAppPlatform, defaultTranslationURL_sl, localizedTranslationURL_sl, localizedTranslationURL_rn, localizedTranslationURL_es, collection_ar, seriesDetail, note, Mendeley Citation Style_1, workUuid, country_ru, gsaentity_City, customTitle_es, AGA, seriesName_en, collection_es, ICNAppVersion, first_open, meeting_ar, SourceModified, defaultTranslationURL_dual, Symbol1, defaultTranslationURL_lo, country_en, region_id, localizedTranslationURL_ne, defaultTranslationURL_to, gsaentity_google_language, e-isbn, region_fr, gsaentity_file_type, UseDefaultLanguage, _DocHome, defaultTranslationURL_de, defaultTranslationURL_km, department_id, defaultTranslationURL_id, localizedTranslationURL_mk, PAA activities, PDFVersion, department_fr, Generator, localizedTranslationURL_dual, abstract_es, defaultTranslationURL_fr, defaultTranslationURL_sm, localizedTranslationURL_fr, defaultTranslationURL_et, cardURL, localizedTranslationURL_uk, Operator, corporateAuthor_ar, defaultTranslationURL_da, localizedTranslationURL_sw, localizedTranslationURL_da, customTitle_zh, localizedTranslationURL_et, sdg, title, Keywords, defaultTranslationURL_mt, DirectFormatting, DocumentToConvert, meeting_id, defaultTranslationURL_hy, Direction, division_fr, localizedTranslationURL_sk, localizedTranslationURL_ru, language, TransitPubID, docType_zh, author_en, defaultTranslationURL_hu, localizedTranslationURL_hu, gsaentity_google_lastmod, agrovoc_ru, collection_fr, ContentTypeId, edition, LinksUpToDate, localizedTranslationURL_en, division_ru, confNumber, abstract_zh, localizedTranslationURL_si, defaultTranslationURL_mn, _AdHocReviewCycleID, database_id, defaultLanguage, author, RapportTaalDocument, revision date, project name, _EmailEntryID, department_es, series, defaultTranslationURL_es, personalAuthor_en, defaultTranslationURL_sv, region_ar, country_id, HeaderDone, _AuthorEmailDisplayName, country_fr, _AuthorEmail, Trapped, defaultTranslationURL_th, docType_ar, PTEX.Fullbanner, Comments, DocType, defaultTranslationURL_no, localizedTranslationURL_no, DocSecurity, gsaentity_Country, abstract, agrovoc_ar, defaultTranslationURL_pt, localizedTranslationURL_pt, division_ar, gsaentity_Location, defaultTranslationURL_ky, localizedTranslationURL_lo, localizedTranslationURL_ky, RapportTitel, localizedTranslationURL_hr, series_zh, geoSelfGoverning, localizedTranslationURL_fa, Afdrukken, department_ru, ICNAppName, codeMantra, LLC, localizedTranslationURL_id, IniName, Your guide to the eatwellplate , localizedTranslationURL_vi, subtitle, series number, _ReviewCycleID, customTitle_fr, LastSaved, RapportDatum, defaultTranslationURL_ki, collection_zh, defaultTranslationURL_si, division_id, placeOfPublication, author_zh, description, meeting_zh, HyperlinksChanged, docType_id, series_en, Category, Docear4Word_StyleTitle, AuthoritativeDomain[2], docType_fr, customTitle_ru, Build, country_ar, collection_ru, defaultTranslationURL_el, keywords, localizedTranslationURL_is, localizedTranslationURL_el, defaultTranslationURL_te, localizedTranslationURL_te, Created, defaultTranslationURL_ml, sortpubdate, customTitle_en, agrovoc_zh, localizedTranslationURL_nl, GENERATOR, collection_en, localizedTranslationURL_ta, customTitle, isbn, CreationDate--Text, User, Division, corporateAuthor_zh, personalAuthor_zh, defaultTranslationURL_ja, ElsevierWebPDFSpecifications, gsaentity_country_content, defaultTranslationURL_he, abstract_ru, localizedTranslationURL_he, Translated, SjabloonVersieDatum, EcoNote, localizedTranslationURL_sv, uuid, defaultTranslationURL_it, localizedTranslationURL_it, Company, AppVersion, author_ar, abstract_en, region_es, Status, localizedTranslationURL_th, localizedTranslationURL_sr, doi, localizedTranslationURL_ar, WPS-JOURNALDOI, docType_es, seriesName_zh, geoNonSelfGoverning, defaultTranslationURL_fa, file_length, publisherName, OLV0_XMD_PAGE_COUNT, MTWinEqns, defaultTranslationURL_mk, otherEntitiesInvolved, CreatorVersion, defaultTranslationURL_vi, epubUrl, XPressPrivate, visibility, WPS-ARTICLEDOI, defaultTranslationURL_uk, meeting_es, defaultTranslationURL_sw, docType, personalAuthor_ar, series_fr, Creator, abstract_ar, defaultTranslationURL_ru, WkDocID, faoProject, defaultTranslationURL_pl, TaalDocument, publicationDate, localizedTranslationURL_pl, Prepared, defaultTranslationURL_is, e-issn, series_ru, collection_id, department_en, localizedTranslationURL_ki, MTEquationNumber2, corporateAuthor_es, defaultTranslationURL_sq, gsaentity_google_encoding, localizedTranslationURL_sq, defaultTranslationURL_nl, seriesName_ar, author_fr, docType_ru, meeting_fr, ScaleCrop, AuthoritativeDomain[1], division_zh, RapportVoettekst, localizedTranslationURL_km, _AssemblyLocation, _AssemblyName, defaultTranslationURL_ca, EMAIL_OWNER_ADDRESS, defaultTranslationURL_ro, gsaentity_doc_source, Base Target, localizedTranslationURL_ro, PXCViewerInfo, localizedTranslationURL_fj, WPS-PROCLEVEL, SOURCE, Type, localizedTranslationURL_mt, author_ru, defaultTranslationURL_lv, localizedTranslationURL_ml, localizedTranslationURL_lv, abstract_fr, agrovoc_fr, year, JobNo, cardText, LCID, meetingDocSymbol, localizedTranslationURL_ba, corporateAuthor_fr, meeting_en, personalAuthor_fr, Papiersoort, localizedTranslationURL_ja, homepage, defaultTranslationURL_tr, localizedTranslationURL_tr, creation date, database_en, gsaentity_file_type_content, project code, gsaentity_Date, ContentType, corporateAuthor_ru, localizedTranslationURL_hi, country_zh, publisher, personalAuthor_ru, author_es, defaultTranslationURL_hr, corporateAuthor_en, seriesName_fr, customTitle_ar, defaultTranslationURL_rn, Subjects, defaultTranslationURL_fi, localizedTranslationURL_fi, alternativeVersion, ADBE_ProducerDetails)