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18. Contempo '81. Health sciences libraries in the United States, 1969 to 1979. Crawford S JAMA; 1981 Jun; 245(21):2237-8. PubMed ID: 7230443 [No Abstract] [Full Text] [Related]
19. Contempo '81. The changing structure of medical group practice in the United States, 1969 to 1980. Freshnock LJ; Jensen LE JAMA; 1981 Jun; 245(21):2173-6. PubMed ID: 7230410 [No Abstract] [Full Text] [Related]