2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6575I give a synopsis of two aspects of the Galactic Cosmic Ray (GCR) acceleration problem: the importance of the medium energy gamma-ray window, and several specific astrophysical sources which merit further investigation.Invited Review, JD01, IAU XXV, Sydney, 13-26 July, 2003. 5 pagesAstrophysicstext