A directory of information resources in the United States: biological sciences.

APA Citation

National Referral Center (U.S.)., National Referral Center for Science and Technology (U.S.). (1972). A directory of information resources in the United States: biological sciences. Washington: Library of Congress; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA Citation

National Referral Center (U.S.), and National Referral Center for Science and Technology (U.S.). A Directory of Information Resources In the United States: Biological Sciences. Washington: Library of Congress; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1972.