000 00322nam a2200121Ia 4500
001 MPKV057740
008 120911s9999 xx 000 0 und d
082 _a500
245 _aPopular Science Vol 202 No.4-6
_c;
246 _aPopular Science Vol 202 No.4-6
260 _aUSA
_bPopular Science
_c1973
650 _aPure Sciences
999 _c55730
_d55730