Christensen, Clayde M. E.C. stakman, statesman of science - St. Paul, Minn. : The American Phytopathological Society, 1984 - 156 p. : ilus LCCN: 23595 Subjects--Topical Terms: Agrónomos--Biografia.Científicos--Biografía. Dewey Class. No.: 920 / C4