003350000a22001330004500060000800000082001500008100002000023245002900043260004400072260000900116300000800125490004200133650002600175  a100  a631.47 GUS  aGustafson,  A F  aUsing and managing soils  aNewyork, Mc Graw- Hill Book Company Inc  c1948  a420  aMc Graw- Hill rural activities series  aUsingh managing soils