“Factors in Food Transportation.”

“A State Endorses the Motor Express.”

By Arthur Capper, “The Midwest Farm Market for Motor Trucks.”

By F. W. Fenn: “The Field of the Motor Truck in the Petroleum Industry”; “The Motor Truck as an Aid in Extracting Raw Materials”; “Motor Truck Operation at the Mines”; “Motorizing the Factory”; “Organization and Operation of a Rural Motor Express Line.”

By R. O. Patten, “Merchandising Motor Trucks.”

By R. O. Patten and F. C. Horner, “The Evils of Overloading.”

Norton, S. V., “The Motor Truck as an Aid to Business Profits,” pp. 155-156, 406-410, 484; A. W. Shaw Co., Chicago.

Power Wagon Reference Book.

Tolley, H. R. and Church, L. M., Bulletin 910, “Experiences of Eastern Farmers with Motor Trucks”; Bulletin 931, “Corn Belt Farmers’ Experience with Motor Trucks”; and Bulletin 1201, “Motor Trucks on Eastern Farms,” The United States Department of Agriculture, Washington.

Vincent, C., “Letters on Grain Marketing Problems,” Privately published, Omaha, 1921.