000 00305nam a2200109 4500
245 _aElementary praticle theory
_cA . D. Martin and T. D. Spearman
100 _aMartin, A D.
710 _aSpearman, T. D.
260 _aAmsterdam
_bNorth Holland
_c1970
300 _axiii.; 527p. 23cm.
082 _a539.921
_bMAR
999 _c22515
_d22515