000 00225 a2200097 4500
001 28160
100 _aMartin, J R
245 _aExplaining understanding and teaching
260 _a
_bMcGraw-Hill
_c1970
090 _c18815
_d18815
942 _aNUST-CAE
_cM
_c9797
999 _c263233
_d263233