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1
A directory of information resources in the United States : Federal Government, with a suppl. of Government-sponsored information resources.
Publicado 1967
“...Library of Congress (Washington, D.C.) National Referral Center for Science and Technology...”
2
A directory of information resources in the United States : social sciences.
Publicado 1965
“...Library of Congress (Washington, D.C.) National Referral Center for Science and Technology...”