New International Encyclopedia. Edited by D. C. Gilman, H. T. Peck and F.M. Colby. New York: Dodd, Mead and Company, 1904. (New International Encyclopedia) 

The American Cyclopedia A popular dictionary of general knowledge. Edited by George Ripley and Charles A. Dana. New York: D. Appleton and Company, 1883. (The American Cyclopedia)

The Century Book of Facts  A handbook of ready reference. Collated and edited by Henry W. Ruoff. Springfield, Mass.: The King-Richardson Company, 1906. (The Century Book of Facts)