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024 _a79108
037 _cTextual
040 _aCRL
_cCRL
_beng
041 _2eng
_aeng
082 _aB63, G1
100 _aEdge W L
_9582220
245 0 _aTheory of ruled surfaces
260 _aCambridge
_bAt The University Press Great Britain
_c1931
300 _a324p.
_ccm.
650 _aMATHEMATICS
942 _hB63, G1
_cTEXL
_2cc
999 _c935349
_d935349