Economic efficiency in pasture production and improvement in southern Iowa /
Heady, Earl O.(Earl Orel),1916-1986.
Olson, R. O.(Russell Oscar),1917-2001,author.
Scholl, J. M.
Iowa State College.Agricultural Experiment Station.
Iowa State College.Department of Economics and Sociology.
Iowa State College.Department of Agronomy.
United States.Agricultural Research Service.
Title from front cover.
Includes bibliographical references.