00342nam a2200121Ia 4500008004100000082002900041100001800070245005800088260002800146300001200174600001700186650001700203140224s9999    xx            000 0 und d  a631.4(8=6-213)(047.1) L2  aSanchez, P.A.  aA review of soils research in tropical Latin America.  aSpringfieldbNTISc1972  av,263p.  aP.A. Sanchez  aSoil science