Contains specifications, correspondence, photographs, and drawings of projects, including the Cypress Abbey Cemetery in San Francisco, the Diamond Head Cemetery in Honolulu, St. Mary's Cemetery Mausoleum in Sacramento. The only residential project in the collection is the Skaggs residence in Piedmont (2 photographs). Includes material written and collected by Cahill on the San Francisco Civic Center, including a 1909 letter of protest sent to the San Francisco Chronicle (but not published) opposing the opening of the Civic Center design contest to architects worldwide instead of limiting it to west coast architects.