000
00269nam a2200109Ia 4500
008
240531s9999 xx 000 0 und d
082
_a
371 3 RIC
100
_a
RICHMOND,W
245
4
_a
The concept of educational technology
260
_a
Wedefield
_b
1970
942
_c
ANF
999
_c
325778
_d
325778