Economy of innovations in dairy farming and adjustments to increase resource ret
Barker, R., Heady, E.O.
Economy of innovations in dairy farming and adjustments to increase resource ret - Ames 1960 - 747-764 p. - Iowa Agricultural Experiment S .
Economy of innovations in dairy farming and adjustments to increase resource ret - Ames 1960 - 747-764 p. - Iowa Agricultural Experiment S .