00524nam a2200145Ia 4500 140224s9999 xx 000 0 und d 631.8 417.2 J6 Hopkins, Donald P. Chemical, humus and the soil; a simple presentation of contemporary knowledge and opinions about fertilizers, manures and soil fertility. London Faber and Faber 1956 288p. Donald P. Hopkins Humus,Soil fertility,Fertilizers and manures,Soil science BK 0 0 0 0 KSD KSD 2014-02-24 0 631.8 417.2 J6 219 2014-02-24 00:00:00 2014-02-24 BK 92128 92128