000 00285 a2200121 4500
080 _a574(07)
_bH 477 N
245 1 _aNew trends in biology teaching
_bVol. III
_cby R. Heller
260 _bUNESCO
_c1971
650 _aBiology
100 1 _aHeller, R.
300 _a376 p.
901 _a109956
999 _c30587
_d30587