Production surfaces and economic optima for corn yields with respect to stand and nitrogen levels /
Pesek, John T.,author.
Heady, Earl O.(Earl Orel),1916-1986,author.
Doll, John P.,author.
Nicholson, R. P.,author.
Iowa State University.Agricultural and Home Economics Experiment Station.
Iowa State University.Department of Agronomy.
Iowa State University.Department of Economics and Sociology.
Tennessee Valley Authority.
Title from front cover.
Includes bibliographical references.