Typically the same as the publication or series. collection: collection:serialset Government Author The names of the Government organizations responsible for authoring or assembling the document. governmentauthor: governmentauthor:congress Publication Date The date the document was first made available to the public. publishdate: publishdate:1927-03-04 Date format is YYYY, YYYY-MM, or YYYY-MM-DD Language The language code of the original document, from the ISO639-2b standard. language: language:eng ILS System ID The 9-digit integer number for the record of the publication in GPO's Integrated Library System, the Catalog of Government Publications (CGP). ilsid: ilsid:001148334 SuDoc Class Number The SuDoc class number from the U.S. Superintendent of Documents which classifies Government publications by publishing agency. sudocclass: sudocclass:"Y 1.1/2:8824" or sudocclass:"69-1:S.RP.488" Note: The SuDoc Class Numbers in GovInfo are typically at the class stem level, not the book number level.