Volume 94, Issue 3, November 1971

## Word problems and recursively enumerable degrees of unsolvability

Pages 389-391 by William W. Boone

## Truth-table degrees and the Boone groups

Pages 392-396 by Donald J. Collins

## On the Kervaire obstruction

Pages 397-413 by Colin P. Rourke, Dennis P. Sullivan

## Measurable cardinals and $\Delta_3^1$ well-orderings

Pages 414-446 by Jack H. Silver

## A structural stability theorem

Pages 447-493 by Joel W. Robbin

## Codimension-one foliations of spheres

Pages 494-503 by H. Blaine Lawson, Jr.

## On the zeta-function of an abelian variety with complex multiplication

Pages 504-533 by Goro Shimura

## A finiteness theorem for $K_2$ of a number field

Pages 534-548 by Howard Garland

## The spectrum of an equivariant cohomology ring. I.

Pages 549-572 by Daniel Qulilen

## The spectrum of an equivariant cohomology ring. II.

Pages 573-602 by Daniel Quillen