A Directory of Information Resources in the United States

National Library of Medicine Current Catalog

by National Library of Medicine (U.S.)

1973

A Directory of Information Resources in the United States: Physical Sciences, Engineering

by National Referral Center (U.S.)

1971

National Agricultural Library Catalog

by National Agricultural Library (U.S.)

1981

A Directory of Information Resources in the United States: Federal Government

by National Referral Center for Science and Technology (U.S.)

1967