Matroid Theory and Its Applications: Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, August 24 - September 2, 1980

Finite Geometric Structures and their Applications: Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Bressanone (Bolzano), Italy, June 18-27, 1972

Combinatorics '86

Combinatorics '90: Recent Trends and Applications

Generators and Relations in Groups and Geometries