000 00304nam a2200121Ia 4500
008 180626s9999 xx 000 0 und d
082 _aR 503 Y87s
245 0 _aYoung scientist volumes 1-20
260 _aLondon
260 _bWorld Book International
260 _c1994
650 _aScience - Encyclopedia
999 _c50289
_d50289