00290nam a2200109Ia 4500082001900000100003600019245003600055260003500091300002000126500000500146700002900151  a511.6bB516.IC  aBerman, Gerald and Fryar, K. D.  aIntroduction to combinatoricsb  aNew YorkbAcademic Pressc1972  axi, 300p. Index  a  aFryar, K. D. ; jt. auth.