On the foundations of combinatorial theory: combinatorial geometries Henry H. Crapo and Gian-Carlo Rota. Crapo, Henry H. Rota, Gian-Carlo, 1932-1999, joint author. Combinatorial analysis. QA164 .C7 513 CRO Includes a bibliography. Cambridge, Mass., M.I.T. Press 1970. 1970. 1970 Text various pagings : eng