000
00297nam a22001217a 4500
003
OSt
008
230607b |||||||| |||| 00| 0 eng d
082
_a
631.4
_b
S99P
100
_a
National Academy of Science
245
_a
Symposium on Soil Productivity
260
_b
N.A.S.C
_c
1972
942
_2
ddc
_c
BK
999
_c
27178
_d
27178