000
00306nam a2200121Ia 4500
001
81033
008
170722s9999 xx 000 0 und d
100
_a
O'day, Edward F.
245
_a
Programmed instruction
_b
Teacniques and trends /
260
_c
1971.
490
_a
Century Psycology series
942
_c
GEN
999
_c
84265
_d
84265