sentences:  After six years in the Evening Session, he graduated in 1955 with a degree in History.In the summer of 1953, Muscarella went on his first excavation at Mesa Verde, a Pueblo Indian site in Colorado, which he followed with work on another excavation at Swan Creek, South Dakota.While at Swan Creek, he received a letter of acceptance from the University of Pennsylvania for graduate study in the Department of Classical Archaeology, and he enrolled.