000
00248nam a22001097a 4500
082
_a
502.8
_b
UNE.U
100
_a
Unesco
245
_a
Unesco source book for science teaching
250
_a
revised
260
_a
France:
_b
Unesco,
_c
1962.
942
_c
BK
999
_c
658112
_d
658112