000
00306nam a2200121Ia 4500
008
220201s1950 xx 000 0 eng d
082
_a
621.31431
100
_a
Gibbs, IB
245
0
_a
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260
_b
New York ; Mc. Graw hill book co.
_c
1950
300
_a
236
942
_2
ddc
999
_c
75056
_d
75056