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020 _a9780486446554
082 0 4 _a162
_bPRA
100 1 _aPrawitz, Dag,
_eauthor.
245 1 0 _aNatural Deduction :
260 _bCourier Dover Publications,
_c2006.
300 _a132 pages
650 0 _aMathematics.
942 _cENGLISH
040 _aYourLibrary
_beng
_cYourLibrary
999 _c590327
_d590327