000 00324nam a2200121Ia 45e0
008 181001s1957 xx 000 0 und d
100 _aShah &Patel
245 0 _aTheory of machine conservation P- I
250 _a1957
260 _c1957
300 _a568
942 _2ddc
_cBK
999 _c155
_d155