2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110702I present selected results from a wide-field CCD survey of the globular cluster systems of giant galaxies, including showing how measurements of the specific frequency of metal-poor globular clusters can constrain the redshift of their formation.4 pages, 1 figure. To appear in proceedings of "Globular Clusters: Guides to Galaxies" conference, March 6-10, 2006Astrophysicstext