000 00308nam a2200121Ia 4500
008 220204s9999 xx 000 0 und d
082 _a631.417
_bFLA
100 _aFlaig, W
245 0 _aOrganic materials and soil productivity
260 _aRome
_bFAO
_c1977
490 _a
_FAO soils bulletin 35
942 _cBK
999 _c41002
_d41002