"*G"@en. "Bibliography"@en. . . . . . . . . . . . . . . . . . . . . . "45"^^. "*GAA"@en. "Per. And Society Publications"@en. . . . "*GAC"@en. "General Works: Introduction. Study. Methods, Etc."@en. . . . "*GAH"@en. "Essays. Miscellanies"@en. . . . "*GAN"@en. "Book Collecting"@en. . . . "*GB"@en. "General Bibliographies"@en. . . . . . . . . . . . . . "*GD"@en. "National Bibliographies"@en. "Countries not listed below, *GD. Colonies and dependencies with the ruling country. "@en. . . . . . . . . . . "*GF"@en. "Booksellers Catalogs: Cataloged"@en. "Private Library sales, if owners' names are known, *GO. "@en. . . . . . "*GGX"@en. "Unknown Classmark"@en. . . . "*GH"@en. "Unknown Classmark"@en. . . . . . . . "*GK"@en. "Book Prices"@en. . . . "*GO"@en. "Catalogs Of Private Libraries Under Name Of Collector"@en. . . . . "*GR"@en. "Libraries United States"@en. "(by name unless so entered) "@en. . . . . . "*GS"@en. "Societies, Hotels, Etc. United States"@en. "(by name unless so entered) "@en. . . . . . . . "*GW"@en. "United States"@en. . . . "*GX"@en. "Great Britain And Dependencies"@en. . . . . "*GY"@en. "Other Countries"@en. "(by name of city unless so entered) "@en. . . . . . "The Billings Classification is a subject classification developed by John Shaw Billings in 1899. It was not an abstract experiment in the mapping of human knowledge, but rather a system devised specifically for the optimum arrangement of the Library’s collections. Dr. Billings envisioned a layout for the building, and while his classification scheme was in fact a division of human intellectual achievement into various subject areas designated by letter codes varying in number (usually three), it was fashioned in such a way as to maximize access to the unique holdings of the Library. The planned physical space—how things would function—all played a role in the construction of his classification. The majority of the Billings classmarks are not longer in use, as NYPL began using a fixed order system in the 1950s."@en. "Billings"@en. . . . . . "541"^^. . . . "64"^^. . . . "2093"^^. . . . "157"^^. . . . . "72"^^. . . . "98"^^. . . . "331"^^. "4"^^. . . . "74"^^. . . . "15"^^. . . . "1205"^^. . . . "82"^^. . . . "175"^^. . . . "769"^^. . . . "230"^^. . . . "422"^^. . . . . . . "Z1001-1121"@en. "General bibliography"@en. . . . . . . "1576"^^.