An explanation of the Superintendent of Documents classification system.
Edition: Rev. ed.
Published: 1973
Place of publication: Washington, D.C
Language: eng
Number of pages: 13
Subjects: United States. -- Superintendent of Documents; Classification -- Government publications
Notes: "As currently used in the Library of the Public Documents Department, United States Government Printing Office, and as catalog numbers for the stocks of Government publications sold by the Superintendent of Documents."

"Slightly revised May 1973."