000 00292 a2200121 4500
082 _a507
_bUn3
245 1 _aNEW UNESCO SOURCE BOOK FOR SCIENCE TEACHING
260 _aParis
_bUnesco
_c1973
300 _a269
650 _aScience -- Study And Teaching
964 _gCIRC
997 _aA30619 C
999 _c461218
_d461218