Oxford University Press US. pp. 34–35. ISBN 0-19-518201-4 ^ Lisa Marie Griffith (2014). Stones of Dublin. Collins Press. ISBN 9781848898721. https://books
Shaft Section, Schooley Colliery - Knox Coal Company, Incorporated - Port Griffith, Luzerne County, Pennsylvania. Bureau of Mines, U.S. Department of the
Shaft Section, Schooley Colliery - Knox Coal Company, Incorporated - Port Griffith, Luzerne County, Pennsylvania. Bureau of Mines, U.S. Department of the