Cite

Iron Pratt Truss Bridge. Bluffton, Iowa (387-176)

MLA

Plowden, David (1932). Iron Pratt Truss Bridge. Bluffton, Iowa (387-176). Box 39. 1987 March. https://collections.library.yale.edu/catalog/2040821.

APA, 6th edition

Plowden, David (1932). (["Box 39"])(1987 March)[Iron Pratt Truss Bridge. Bluffton, Iowa (387-176)]. https://collections.library.yale.edu/catalog/2040821.