(1965). A directory of information resources in the United States: Physical sciences, biological sciences, engineering. Washington: Government Printing Office.
Παραπομπή Chicago StyleA Directory of Information Resources in the United States: Physical Sciences, Biological Sciences, Engineering. Washington: Government Printing Office, 1965.
Παραπομπή MLAA Directory of Information Resources in the United States: Physical Sciences, Biological Sciences, Engineering. Washington: Government Printing Office, 1965.
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