Volume 55, Number 1, September 1990
: Wreath products by the symmetric groups and product posets of Young's lattices.
: Solution of a delta-system decomposition problem.
Asia Ivic Weiss
: Some infinite families of finite incidence-polytopes.
: On the action of the symmetric group on the Free Lie Algebra and the partition lattice.
Aiden A. Bruen
: Nuclei of sets of q + 1 points in PG(2, q) and blocking sets of Redei type.
: Notes on dimensional closure spaces.
Volume 55, Number 2, November 1990