000
00306nam a2200121Ia 4500
001
81799
008
170722s9999 xx 000 0 und d
100
_a
Tharp, Roland G. And
245
_a
Behaviour modification in the natural environment /
260
_c
1969.
700
_a
Wetzel, Ralph J.
942
_c
GEN
999
_c
76007
_d
76007