00258nam a22001097a 4500003000400000008004100004082001600045100002300061245003000084260002700114300000700141OSt240208b        |||||||| |||| 00| 0 eng d  a631.4bT79I  aTroeh, Fredrick R.  aIntroductory Soil Science  bSowasta Univ. P.c1966  a95