Volume 133, Issue 2, March 1991

The spectra of nonnegative matrices via symbolic dynamics

Pages 249-316 by Mike Boyle, David Handelman

Collapsing and pinching under a lower curvature bound

Pages 317-357 by Takao Yamaguchi

Entropy of polynomial and rational maps

Pages 359-368 by Shmuel Friedland

A proof of the Kegel-Wielandt conjecture on subnormal subgroups

Pages 369-428 by Peter B. Kleidman

Isoparametric foliations and their buildings

Pages 429-446 by Gudlaugur Thorbergsson