Historic American Engineering Record catalog :
a list of measured drawings, photographs, and written documentation in the Record, April 1972.

APA Citation

Historic American Engineering Record. (1972). Historic American Engineering Record catalog: a list of measured drawings, photographs, and written documentation in the Record, April 1972. Washington, D.C.: Dept. of the Interior, National Park Service.

MLA Citation

Historic American Engineering Record. Historic American Engineering Record Catalog: a List of Measured Drawings, Photographs, And Written Documentation In the Record, April 1972. Washington, D.C.: Dept. of the Interior, National Park Service, 1972.