003490000a22001330004500060000800000082001400008100002100022100002200043245003500065260003100100260000900131300000800140650006700148  a100  a631.8 TIS  aNelson, Werner L  aTisdale, Samuel L  aSoil fertility and fertilizers  aLondon, Mac Millan Company  c1966  a675  aSoil fertility- Fertilizers/ Soil management- Cropping Systems