National Referral Center (U.S.)

• A directory of information resources in the United States: biological sciences
• A directory of information resources in the United States: Federal Government
• A directory of information resources in the United States: physical sciences, engineering
• A directory of information resources in the United States: social sciences
• Directory of Federally supported information analysis centers
• A Directory of information resources in the United States
• A directory of information resources in the United States: physical sciences, engineering
• Directory of federally supported information analysis centers, 1979
• Selected information resources on meteorology