000			00340nam a2200145Ia 4500
001			11404
008			170722s9999 xx 000 0 und d
100			_aCrowther, J. G.
245			_aDiscoveries and inventions of the twentieth century /
250			_a4th ed.
260			_c1957.
653			_aScience
653			_aWorld
942			_cGEN
999			_c50572 _d50572