classic papers of the week -- 85

On the Curvature of Space

• Friedman, A.

Cosmic Rays as the Source of General Galactic Radio Emission

• Kiepenheuer, K. O. (Yerkes Observatory, University of Chicago, Williams Bay, Wisconsin)

Symmetry between particle and anti-particle populations in the universe

• Hong-Yee Chiu (Institute for Space Studies, Goddard Space Flight Center, National Aeronautics and Space Administration, New York, NY, and Physics Department and Earth and Space Sciences Department, State University of New York, Stony Brook)