000
00285 a2200121 4500
080
_a
574(07)
_b
H 477 N
245
1
_a
New trends in biology teaching
_b
Vol. III
_c
by R. Heller
260
_b
UNESCO
_c
1971
650
_a
Biology
100
1
_a
Heller, R.
300
_a
376 p.
901
_a
109956
999
_c
30587
_d
30587