00519nam a2200157Ia 4500008004100000082001700041100003000058245006000088260002800148300001400176600003400190650001600224942000700240952009700247999001700344140224s9999    xx            000 0 und d  a631.001.5 M6  aHildebrand, Peter E., ed.  aPerspectives on farming systems research and extension/  aColoradobReinnerc1986  axiv,165p.  aEdited by Peter E. Hildebrand  aAgriculture  cBK  00104070aKSDbKSDd2014-02-24l0o631.001.5 M6p4713r2014-02-24 00:00:00w2014-02-24yBK  c94915d94915