"Mixing the first batch of concrete for Crib #1 on the heavy duty bridge at the site of Norris Dam, just below the Dam itself."

Chicago citation style
Tennessee Valley Authority. 1933-. "Mixing the first batch of concrete for Crib #1 on the heavy duty bridge at the site of Norris Dam, just below the Dam itself.". 1933-11-01. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/532709. (Accessed June 24, 2018.)
APA citation style
Tennessee Valley Authority. 1933-, (1933-11-01) "Mixing the first batch of concrete for Crib #1 on the heavy duty bridge at the site of Norris Dam, just below the Dam itself.". Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/532709
MLA citation style
Tennessee Valley Authority. 1933-. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/532709>.
Note: These citations are programmatically generated and may be incomplete.