00352nam a2200121Ia 4500082001900000100002800019245003100047260005600078300001400134490007200148500000500220700000500225  a511.6bR842.SC  aRota, Gian-Carlo d ed.  aStudies in combinatoricsb  aNew YorkbMathematical Association of Americac1978  axi, 262p.  aMathematical Association of America, studies in Mathematicsv v. 17  a  a