Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
National Library of Medicine, Bethesda, Maryland, April 7, 1961, rib-reinforcement, pouring concrete - high roof: [construction]
National Library of Medicine, Bethesda, Maryland, April 7, 1961, rib-reinforcement, pouring concrete - high roof: [construction]
Image caption on page 69 of the book US National Library of Medicine: "Workers pour concrete into the rib reinforcements of the roof of the new library building."
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)