Rochester, G. D. and O'Ceallaigh, C. and George, E. P. and Galbraith, W. and Whitehouse, W. J. and Barton, J. C. and Jelley, J. V. and Sturgess, J. W. and O'Ceallaigh, C. and Rochester, G. D. (1951) Papers read at Cosmic Ray Colloquium September, 1951. Communications of the Dublin Institute for Advanced Studies. ISSN Series A (Theoretical Physics) 0070-7414