00409nam a2200133Ia 4500008004100000082001600041100003700057245003800094260004000132300000900172650004100181650003400222653001900256170901s1968    xx            000 0 und d  a631.8bP66S  aPontificia Academia Scientiarvm. 0aOrganic Matter and Soil Fertility  aNew YarkbJohn Wiley and Sonsc1968  a1017  aAgriculture and related technologies  aTechnology (Applied sciences)  aSoil fertility