000 00363nam a2200157Ia 4500
008 180626s9999 xx 000 0 und d
082 _22nd
082 _a500 B614eo 1979
100 _aBlecha, Milo K.
245 0 _aExploring scienceorange book
260 _aIllinois
260 _bLaidlaw Brothers
260 _cc1979
300 _a144 p
650 _aScience
999 _c47445
_d47445