Harper, J. A.; Hank Ball (1995). "Samuel Kier - Medicine Man & Refiner". Excerpt from Yo-Ho-Ho and a Bottle of Unrefined Complex Liquid Hydrocarbons. Pennsylvania Geology, v. 26, No. 1, p. -. Oil Region Alliance of Business, Industry & Tourism. Archived from the original on 2012-03-15. Retrieved 2008-12-12.
Harper, J. A.; Hank Ball (1995). "Samuel Kier - Medicine Man & Refiner". Excerpt from Yo-Ho-Ho and a Bottle of Unrefined Complex Liquid Hydrocarbons. Pennsylvania Geology, v. 26, No. 1, p. -. Oil Region Alliance of Business, Industry & Tourism. Archived from the original on 2012-03-15. Retrieved 2008-12-12.