000 00256nam a22001097a 4500
999 _c156191
_d156191
082 _a153.753 EN57C
100 _aEngelmann, Siegfried
245 _aConceptual Learning
260 _aSouth Dakota
_bADAPT Press
_c1969
300 _a102p.
_b23cm.
942 _cBK