000 00302nam a22001097a 4500
082 _a621.3132
100 _aLangsdorf, Alexander S.
245 _aPrinciples of Direct-Current Machines
260 _aNew York
_bMcGraw-Hill Book Company, Inc.
_c1931
300 _axxvi.; 586 pages
_billustrations
942 _cBK
999 _c1077
_d1077