.agricultural practices and water qualitybsmith,george edward,1913- (ed.)
willrich,ted l. ed.
agricultural practices and water qualitybsmith,george edward,1913- (ed.) - 1st ed. | .Amesbowa State Univ. Press 1970
agricultural practices and water qualitybsmith,george edward,1913- (ed.) - 1st ed. | .Amesbowa State Univ. Press 1970