The Harlow Shapley Symposium on Globular Cluster Systems in Galaxies : proceedings of the 126th symposium of the International Astronomical Union, held in Cambridge, Massachusetts, U.S.A., August 25-29, 1986 - Grindlay, Jonathan E.; Philip, A. G. Davis; Shapley, Harlow, 1885-1972 (Symposium (International Astronomical Union), 1988)