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020 _a84484
041 _aEN
082 _a500
_bPRO
_223
110 _9133739
_aPrepared by The Central office of information
245 _aPROGRESS in science
_c/ Prepared by The Central office of information
260 _aPlaistow
_bThe curwen press
_c0
300 _a63 p.-
440 _aModern world series
509 _aNS
650 _aScience
942 _cS