000 00284nam a2200109Ia 4500
008 130123s9999 xx 000 0 und d
082 _a DAV
100 _aDavid, Thomas G.
245 _aLearning Envirmments .
260 _aChicago
_bChicago Univ. Press.
_c1975
700 _a Wright, B.D.
999 _c83990
_d83990