## Contents of Volume 311, Number 2

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- The error in spatial truncation for systems of parabolic conservation laws
- Hung Ju Kuo PDF
- Trans. Amer. Math. Soc.
**311**(1989), 433-465

- Regular coverings of homology $3$-spheres by homology $3$-spheres
- E. Luft and D. Sjerve PDF
- Trans. Amer. Math. Soc.
**311**(1989), 467-481

- Unramified class field theory for orders
- Peter Stevenhagen PDF
- Trans. Amer. Math. Soc.
**311**(1989), 483-500

- A criterion for the boundedness of singular integrals on hypersurfaces
- Stephen W. Semmes PDF
- Trans. Amer. Math. Soc.
**311**(1989), 501-513

- A $K$-theoretic invariant for dynamical systems
- Yiu Tung Poon PDF
- Trans. Amer. Math. Soc.
**311**(1989), 515-533

- On the linear representation of braid groups
- D. D. Long PDF
- Trans. Amer. Math. Soc.
**311**(1989), 535-560

- The connection matrix theory for Morse decompositions
- Robert D. Franzosa PDF
- Trans. Amer. Math. Soc.
**311**(1989), 561-592

- Characterization of nonlinear semigroups associated with semilinear evolution equations
- Shinnosuke Oharu and Tadayasu Takahashi PDF
- Trans. Amer. Math. Soc.
**311**(1989), 593-619

- Equivariant Morse theory for starshaped Hamiltonian systems
- Claude Viterbo PDF
- Trans. Amer. Math. Soc.
**311**(1989), 621-655

- On the monoid of tame extensions
- Cornelius Greither and D. K. Harrison PDF
- Trans. Amer. Math. Soc.
**311**(1989), 657-682

- Stability of viscous scalar shock fronts in several dimensions
- Jonathan Goodman PDF
- Trans. Amer. Math. Soc.
**311**(1989), 683-695

- Invariants of graphs in three-space
- Louis H. Kauffman PDF
- Trans. Amer. Math. Soc.
**311**(1989), 697-710

- Nonlinear second order elliptic partial differential equations at resonance
- R. Iannacci, M. N. Nkashama and J. R. Ward PDF
- Trans. Amer. Math. Soc.
**311**(1989), 711-726

- Infix congruences on a free monoid
- C. M. Reis PDF
- Trans. Amer. Math. Soc.
**311**(1989), 727-737

- Codimension two complete noncompact submanifolds with nonnegative curvature
- Maria Helena Noronha PDF
- Trans. Amer. Math. Soc.
**311**(1989), 739-748

- Multiple solutions of perturbed superquadratic second order Hamiltonian systems
- Yi Ming Long PDF
- Trans. Amer. Math. Soc.
**311**(1989), 749-780

- Approximating continuous functions by holomorphic and harmonic functions
- Christopher J. Bishop PDF
- Trans. Amer. Math. Soc.
**311**(1989), 781-811

- Factorization of diffusions on fibre bundles
- Ming Liao PDF
- Trans. Amer. Math. Soc.
**311**(1989), 813-827