000
00454nam a22001937a 4500
015
_a
1638
041
_a
1
080
_a
631.8
_b
HOP
100
_a
Hopkins, D.P,
245
_a
Chemicals, Humus, and the Soil
260
_a
Chemical Publishing Co., Inc
_b
N.Y.
_c
1948
300
_a
358p.
650
_a
Agriculture
852
_a
4L5-3
999
_c
4220
_d
4220