000
00308nam a2200121Ia 4500
008
220204s9999 xx 000 0 und d
082
_a
631.417
_b
FLA
100
_a
Flaig, W
245
0
_a
Organic materials and soil productivity
260
_a
Rome
_b
FAO
_c
1977
490
_a
_F
AO soils bulletin 35
942
_c
BK
999
_c
41002
_d
41002