00485nam a2200145Ia 4500001000500000005001700005008004100022082001200063100002600075245007100101260002600172650003600198999001500234952009000249202220261006003603.0120911s9999    xx            000 0 und d  a630 HEA  aHeady, Earl O. 93062  aAgricultural production functions / Earl O. Heady, John L. Dillion  aIowa State Uni. Press  aProgrammable controllers.92094  c2022d2022  00104070aNUbNUd2012-09-11l0o630 HEAp2126r2012-09-11 00:00:00w2012-09-11yOS