000 00303nam a2200109Ia 4500
008 201121s9999 xx 000 0 und d
100 _aKoshland,D.E.
245 0 _aProceeding of The National Academy of Science U S A
260 _bWashington University of Chicago Press
300 _c2600
942 _cBV
999 _c16458
_d16458