00349nam a2200109Ia 4500008004100000040001100041100002200052245008400074260005500158300001600213300001000229251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aF. peter Woodford 0aProceedings of the National Academy Of Sciences of the United States of America  cMay, 1971bThe National Academy of SciencesaU.S.A  aP. 873-1990  bV. 68