1. List of Depository Libraries by State and City as of March 1981,1981
2. Statistical Abstract of the United States 1980,1980
3. 44. U.S.C. 1912.
4. See List of Classes of United States Government Publications Available for Selection by Depository Libraries, published irregularly by the Office of the Assistant Public Printer (Superintendent of Documents). Washington, D.C.: U.S. Government Printing Office.
5. Summary of Biennial Report of Depository Libraries: Report Series No. 15,1979