SOURCES OF INFORMATION
Crystal River Current, 1886-1887. Marble City Times, 1893-1894. Marble Booster, 1911-1917. Geological Survey Bulletin 884 by J. W. Vanderwilt. History of the State of Colorado by Frank Hall, The Blakely Printing Company, Chicago, Ill., Vol. IV. A Statement to the Stockholders of the Colorado-Yule Marble Co., by J. F. Manning. Data concerning dates of sales, buildings, etc. History of Yule Marble Companies’ Properties at Marble by Edward C. Hanley, dated at Denver, Colo., Feb. 14, 1929. Vermont Marble Co., Proctor, Vt.