000 00263nam a2200109Ia 4500
008 240531s9999 xx 000 0 und d
082 _aR503 MCG
100 _aNULL
245 0 _aMcGraw Hill encyclopedia of science
260 _aMcGraw-Hill
_b1977
942 _cAREF
999 _c311839
_d311839