Columbia subject headings:
Government information--United States--Handbooks, manuals, etc.
Internet--Handbooks, manuals, etc.
Harvard subject headings:
Electronic government information--United States--Directories.
Federal government--United States--Bibliography.
Government information--United States--Computer network resources--Directories.
Government information--United States--Databases--Directories.
Government information--United States--Information services--Directories.
Internet
Internet addresses--Directories
United States--Politics and government--Bibliography.
Princeton subject headings: