The principal differences between the 1950 Standard specifications and the 1957 Standard specifications.

APA Citation

Michigan. State Highway Dept. (1957). The principal differences between the 1950 Standard specifications and the 1957 Standard specifications. [Lansing? Mich..

MLA Citation

Michigan. State Highway Dept. The Principal Differences Between the 1950 Standard Specifications And the 1957 Standard Specifications. [Lansing? Mich., 1957.

Warning: These citations may not always be complete (especially for serials).