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This volume, together with those on Cosmic Rays in the Heliosphere and on Cosmic Rays at Earth, rounds off a trilogy devoted to cosmic rays. It specifically deals with the astrophysical sources and acceleration processes of cosmic rays. The principal aims are to examine the cosmic ray phenomenon in the context of our evolving understanding of the Galaxy as an astrophysical system. Observations of cosmic rays, and theoretical models of their origin and propagation, are critically reviewed. The extent to which these reinforce, or conflict with, other astronomical information about the Galaxy is addressed. Other themes are the extent to which galactic-scale processes can be illuminated by studies or analogous heliospheric processes, and the identification of key questions for future investigations. The workshop assembled physicists working in the fields of cosmic rays origin and propagation, structure, evolution, and composition of the Galaxy and the interstellar medium. In addition, researchers working in relevant areas of radio, optical, X-ray and gamma-ray astronomy attended the workshops. This has strengthened the interdisciplinary links between these scientific communities.

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Proceedings from two ISSI workshops, held October 18-22, 1999 and May 15-19, 2000 in Bern, Switzerland. Specifically deals with the astrophysical source of acceleration processes of cosmic rays.