00381    a2200121   4500082001600000100002500016245003400041260005100075300001900126650005700145650004000202650001700242  a631.45bAYR  aAyres, Quincy Clauds  aSoil erosion and its control   aNew YorkbMcGraw-Hill Book Companyc1936g1936  axi,365p.c23cm  aSpecific techniques; apparatus, equipment, materials  aSoil fertility, acidity, alkalinity  aSoil science