corn, corn varieties, agronomy department, corn history, corn culture
Agricultural Extension Service, South Dakota State College of Agriculture and Mechanic Arts
In the study of corn culture a very intimate knowledge of corn varieties is a necessity. The experienced corn grower known the advantages of different varieties and if he is a corn breeder he will endeavor to develop some of the more desirable characters of several varieties into one variety.
Johnston, Ralph E. and Valentine, George H., "Corn Groups and Varieties" (1923). SDSU Extension Circulars. 101.