Date of this Version
Sjogren, O. W., Brackett, E. E., Smith, C. W. & Nohavec, F. R. (1921). The Nebraska tractor law and rules for official tractor tests (University of Nebraska Agricultural Experiment Station Circular No. 13)
The Nebraska Tractor Law, which became effective July 15, 1919, was enacted to encourage the manufacture and sale of improved types of tractors and to contribute to a more successful use of the tractor for farming. It was thought that the best method of accomplishing these objects would be to require a tractor of each model sold in the State to be tested at the State University and to have the results of these tests made public.