United States., D. o. C. (1973). Geographic base file system, establishing a continuing program: Conference proceedings, January 18 and 19, 1973, Settle, Wash. Washington, D.C: Government Printing Office.
Παραπομπή Chicago StyleUnited States., Department of Commerce. Geographic Base File System, Establishing a Continuing Program: Conference Proceedings, January 18 and 19, 1973, Settle, Wash. Washington, D.C: Government Printing Office, 1973.
Παραπομπή MLAUnited States., Department of Commerce. Geographic Base File System, Establishing a Continuing Program: Conference Proceedings, January 18 and 19, 1973, Settle, Wash. Washington, D.C: Government Printing Office, 1973.
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