Plant and animal improvement : a textbook for students of agriculture,
Roberts, Elmer,1886-1983.
Davenport, E.(Eugene),1856-1941.
Boston ; New York : Ginn and Company,
©1925
"References" at end of most of the chapters.
Breeding.
Domestic animals.
Plants, Cultivated.
Breeding.
Domestic animals.
Plants, Cultivated.