00361nam a2200121Ia 4500008004100000020001400041100002900055245008000084260003900164300001000203942000700213999001900220251117s9999||||xx |||||||||||||| ||und||  a897662946  aSmith, George F.9110808 0aMolecular Structure of the Number 21 Chromosome and Down Syndrome Vol-450th  bNew York Academy of Sciencesc1985  a250p.  cBK  c270383d270383