## Contents of Volume 311, Number 1

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- Determination of all imaginary cyclic quartic fields with class number $2$
- Kenneth Hardy, Richard H. Hudson, David Richman and Kenneth S. Williams PDF
- Trans. Amer. Math. Soc.
**311**(1989), 1-55

- Continuous cohomology and real homotopy type
- Edgar H. Brown and Robert H. Szczarba PDF
- Trans. Amer. Math. Soc.
**311**(1989), 57-106

- Realizing rotation vectors for torus homeomorphisms
- John Franks PDF
- Trans. Amer. Math. Soc.
**311**(1989), 107-115

- Lie sphere transformations and the focal sets of certain taut immersions
- Steven G. Buyske PDF
- Trans. Amer. Math. Soc.
**311**(1989), 117-133

- Peripherally specified homomorphs of knot groups
- Dennis Johnson and Charles Livingston PDF
- Trans. Amer. Math. Soc.
**311**(1989), 135-146

- Spectral decompositions of one-parameter groups of isometries on Hardy spaces
- Dimitri Karayannakis PDF
- Trans. Amer. Math. Soc.
**311**(1989), 147-166

- Differential-difference operators associated to reflection groups
- Charles F. Dunkl PDF
- Trans. Amer. Math. Soc.
**311**(1989), 167-183

- Torsion points on abelian étale coverings of $\textbf {P}^ 1-\{0,1,\infty \}$
- Robert F. Coleman PDF
- Trans. Amer. Math. Soc.
**311**(1989), 185-208

- A converse to the mean value property on homogeneous trees
- Massimo A. Picardello and Wolfgang Woess PDF
- Trans. Amer. Math. Soc.
**311**(1989), 209-225

- Proper holomorphic mappings from the two-ball to the three-ball
- J. A. Cima and T. J. Suffridge PDF
- Trans. Amer. Math. Soc.
**311**(1989), 227-239

- Torsion points of generic formal groups
- Michael Rosen and Karl Zimmermann PDF
- Trans. Amer. Math. Soc.
**311**(1989), 241-253

- Topological entropy of homoclinic closures
- Leonardo Mendoza PDF
- Trans. Amer. Math. Soc.
**311**(1989), 255-266

- Excessive measures and the existence of right semigroups and processes
- J. Steffens PDF
- Trans. Amer. Math. Soc.
**311**(1989), 267-290

- Spreading of singularities at the boundary in semilinear hyperbolic mixed problems. II. Crossing and self-spreading
- Mark Williams PDF
- Trans. Amer. Math. Soc.
**311**(1989), 291-321

- Primary cycles on the circle
- Louis Block, Ethan M. Coven, Leo Jonker and Michał Misiurewicz PDF
- Trans. Amer. Math. Soc.
**311**(1989), 323-335

- Conjugating homeomorphisms to uniform homeomorphisms
- Katsuro Sakai and Raymond Y. Wong PDF
- Trans. Amer. Math. Soc.
**311**(1989), 337-356

- Translation semigroups and their linearizations on spaces of integrable functions
- Annette Grabosch PDF
- Trans. Amer. Math. Soc.
**311**(1989), 357-390

- Variations of Hodge structure, Legendre submanifolds, and accessibility
- James A. Carlson and Domingo Toledo PDF
- Trans. Amer. Math. Soc.
**311**(1989), 391-411

- Specializations of finitely generated subgroups of abelian varieties
- D. W. Masser PDF
- Trans. Amer. Math. Soc.
**311**(1989), 413-424

- Correction to: “Harmonically immersed surfaces in $\textbf {R}^ n$” [Trans. Amer. Math. Soc.
**307**(1988), no. 1, 363–372; MR0936822 (89g:53006)] - Gary R. Jensen and Marco Rigoli PDF
- Trans. Amer. Math. Soc.
**311**(1989), 425-428

- Corrigendum to: “Convex subcones of the contingent cone in nonsmooth calculus and optimization” [Trans. Amer. Math. Soc.
**302**(1987), no. 2, 661–682; MR0891640 (89d:58017)] - Doug Ward PDF
- Trans. Amer. Math. Soc.
**311**(1989), 429-431