Jim Crawford photograph postcards

File contains seven postcards that were not mailed, attached together through one hole in the top left corner with a rusted metal duo-tang clip through it. The front of each postcard has a reproduction of a black and white photograph, with images of concrete blocks, lumber, piping, and bags of mortar. There is no writing on the back of the postcards; the seventh in the set has a black ink stamp which reads "Jim Crawford, Artist" with the signature "JC '72" in pencil above.