## Contents of Volume 152, Number 2

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- Metabelian $p$-groups of maximal class
- R. J. Miech PDF
- Trans. Amer. Math. Soc.
**152**(1970), 331-373

- On the cohomology of stable two stage Postnikov systems
- John R. Harper PDF
- Trans. Amer. Math. Soc.
**152**(1970), 375-388

- A surface in $E^{3}$ is tame if it has round tangent balls
- L. D. Loveland PDF
- Trans. Amer. Math. Soc.
**152**(1970), 389-397

- The dual topology for the principal and discrete series on semisimple groups
- Ronald L. Lipsman PDF
- Trans. Amer. Math. Soc.
**152**(1970), 399-417

- Spectral representation of certain one-parametric families of symmetric operators in Hilbert space
- A. E. Nussbaum PDF
- Trans. Amer. Math. Soc.
**152**(1970), 419-429

- Functional analytic properties of topological semigroups and $n$-extreme amenability
- Anthony To-ming Lau PDF
- Trans. Amer. Math. Soc.
**152**(1970), 431-439

- Solutions to nonlinear hyperbolic Cauchy problems without convexity conditions
- Donald P. Ballou PDF
- Trans. Amer. Math. Soc.
**152**(1970), 441-460

- A generalization of parallelism in Riemannian geometry, the $C^{\omega }$ case
- Alan B. Poritz PDF
- Trans. Amer. Math. Soc.
**152**(1970), 461-494

- Decomposing manifolds into homologically equivalent submanifolds
- J. Scott Downing PDF
- Trans. Amer. Math. Soc.
**152**(1970), 495-501

- On the structure of primary abelian groups of countable Ulm type
- Doyle O. Cutler PDF
- Trans. Amer. Math. Soc.
**152**(1970), 503-518

- On the solutions of a class of linear selfadjoint differential equations
- Larry R. Anderson and A. C. Lazer PDF
- Trans. Amer. Math. Soc.
**152**(1970), 519-530

- Actions of the torus on $4$-manifolds. I
- Peter Orlik and Frank Raymond PDF
- Trans. Amer. Math. Soc.
**152**(1970), 531-559

- Group algebra modules. III
- S. L. Gulick, T.-S. Liu and A. C. M. van Rooij PDF
- Trans. Amer. Math. Soc.
**152**(1970), 561-579

- Group algebra modules. IV
- S. L. Gulick, T.-S. Liu and A. C. M. van Rooij PDF
- Trans. Amer. Math. Soc.
**152**(1970), 581-596

- Semigroups through semilattices
- J. H. Carruth and Jimmie D. Lawson PDF
- Trans. Amer. Math. Soc.
**152**(1970), 597-608

- Cohomology of $F$-groups
- Peter Curran PDF
- Trans. Amer. Math. Soc.
**152**(1970), 609-621

- On automorphism groups of $C^*$-algebras
- Mi-soo Bae Smith PDF
- Trans. Amer. Math. Soc.
**152**(1970), 623-648

- Closedness of coboundary modules of analytic sheaves
- Yum-tong Siu and Günther Trautmann PDF
- Trans. Amer. Math. Soc.
**152**(1970), 649-658