000			00327nam a2200109Ia 4500
008			130130s9999 xx 000 0 und d
082			_a630 HEA
100			_aHeady, Earl O.
245			_aAgricultural production functions / Earl O. Heady, John L. Dillion
260			_aIowa State Uni. Press
650			_aProgrammable controllers.
999			_c29832 _d29832