Washlaski, Raymond A.; Ryan P. Washlaski; Peter E. Starry, Jr. (February 25, 2006). "Calumet Mine & Coke Works". Virtual Museum of Coal Mining in Western Pennsylvania. Archived from the original on July 12, 2009. Retrieved April 30, 2008.
Washlaski, Raymond A.; Ryan P. Washlaski; Peter E. Starry, Jr. (February 25, 2006). "Calumet Mine & Coke Works". Virtual Museum of Coal Mining in Western Pennsylvania. Archived from the original on July 12, 2009. Retrieved April 30, 2008.