00345nam a2200121Ia 4500008004100000082002200041100002200063245004400085260003500129300001600164600002100180650002200201140224s9999    xx            000 0 und d  a631.459:631.61 J9  aFoster, Albert B.  aApproved practices in soil conservation  aCalcuttabOxford and IBHc1959  axviii,384p.  aAlbert B. Foster  aSoil conservation