## Contents of Volume 312, Number 2

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- Bifurcation of critical periods for plane vector fields
- Carmen Chicone and Marc Jacobs PDF
- Trans. Amer. Math. Soc.
**312**(1989), 433-486

- On the reconstruction of topological spaces from their groups of homeomorphisms
- Matatyahu Rubin PDF
- Trans. Amer. Math. Soc.
**312**(1989), 487-538

- Bifurcation of a unique stable periodic orbit from a homoclinic orbit in infinite-dimensional systems
- Shui-Nee Chow and Bo Deng PDF
- Trans. Amer. Math. Soc.
**312**(1989), 539-587

- Two-dimensional Riemann problem for a single conservation law
- Tong Zhang and Yu Xi Zheng PDF
- Trans. Amer. Math. Soc.
**312**(1989), 589-619

- Topological types of finitely-$C^ 0$-$K$-determined map-germs
- Takashi Nishimura PDF
- Trans. Amer. Math. Soc.
**312**(1989), 621-639

- Sharp estimates for the nontangential maximal function and the Lusin area function in Lipschitz domains
- Rodrigo BaĆ±uelos and Charles N. Moore PDF
- Trans. Amer. Math. Soc.
**312**(1989), 641-662

- Piecewise linearization of real-valued subanalytic functions
- Masahiro Shiota PDF
- Trans. Amer. Math. Soc.
**312**(1989), 663-679

- A unified theory for real vs. complex rational Chebyshev approximation on an interval
- Arden Ruttan and Richard S. Varga PDF
- Trans. Amer. Math. Soc.
**312**(1989), 681-697

- Hypergraphs with finitely many isomorphism subtypes
- Henry A. Kierstead and Peter J. Nyikos PDF
- Trans. Amer. Math. Soc.
**312**(1989), 699-718

- A Poisson-Plancherel formula for the universal covering group with Lie algebra of type $B_ n$
- Peter Dourmashkin PDF
- Trans. Amer. Math. Soc.
**312**(1989), 719-738

- Higher-dimensional analogues of the modular and Picard groups
- C. Maclachlan, P. L. Waterman and N. J. Wielenberg PDF
- Trans. Amer. Math. Soc.
**312**(1989), 739-753

- Cohomology equations and commutators of germs of contact diffeomorphisms
- Augustin Banyaga, Rafael de la Llave and C. Eugene Wayne PDF
- Trans. Amer. Math. Soc.
**312**(1989), 755-778

- Uniform analyticity of orthogonal projections
- R. R. Coifman and Margaret A. M. Murray PDF
- Trans. Amer. Math. Soc.
**312**(1989), 779-817

- Nonuniqueness for solutions of the Korteweg-de Vries equation
- Amy Cohen and Thomas Kappeler PDF
- Trans. Amer. Math. Soc.
**312**(1989), 819-840

- Finitely presented lattices: canonical forms and the covering relation
- Ralph Freese PDF
- Trans. Amer. Math. Soc.
**312**(1989), 841-860