Abstract Ian A. Smith was an employee of the California Portland Cement Company's Colton Plant from 1952-1977. Smith also conducted research regarding the history of mining operations at Slover Mountain in Colton, California. The Ian A. Smith papers primarily focus on the California Portland Cement Company's presence at Slover Mountain, but also contain material regarding Isaac Slover and the history of the southwestern United States, particularly that of San Bernardino County, California. Two...