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MLA

Yerkes, Arnold P. Practical hints on running a gas engine . U.S. Dept. of Agriculture, 1919.

APA

Yerkes, Arnold P. (1919). Practical hints on running a gas engine. U.S. Dept. of Agriculture.

Chicago

Yerkes, Arnold P. Practical hints on running a gas engine . U.S. Dept. of Agriculture, 1919.