Books by Willis B. Combs

Grain grading primer

by Willis B. Combs

1940

Outlines for 4-H club grain grading demonstrations

by Willis B. Combs

1954

Agricultural processing pamphlets

by George P. Bodnar, John Herron Cox, Harold E. Earp, W. M. Hurst, R. C. Miller, E. A. Back, R. T. Cotton, H. D. Young, Dorothy Nickerson, Willis B. Combs, W. P. Carroll, F. G. Smith, Raymond L. Spangler, United States. Bureau of Agricultural Economics, United States. Department of Agriculture. National Agricultural Library.

1920