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Start Over Subjects National Library of Medicine (U.S.) ✖Remove constraint Subjects: National Library of Medicine (U.S.) Titles National Library of Medicine, Bethesda, Maryland, April 7, 1961, rib-reinforcement, pouring concrete - high roof: [construction] ✖Remove constraint Titles: National Library of Medicine, Bethesda, Maryland, April 7, 1961, rib-reinforcement, pouring concrete - high roof: [construction] Genre Photographs ✖Remove constraint Genre: Photographs Copyright Public domain ✖Remove constraint Copyright: Public domain

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