A Directory of information resources in the United States.
Social sciences.

APA Citation

National Referral Center for Science and Technology (U.S.)., National Referral Center (U.S.). A Directory of information resources in the United States. Washington: Library of Congress.

MLA Citation

National Referral Center for Science and Technology (U.S.), and National Referral Center (U.S.). A Directory of Information Resources In the United States. Washington: Library of Congress,