Bedford, E. D. T. (1918). The discovery of coal in northeastern Pennsylvania and life in the mining region: Paper read before the Hamilton Library Association, Carlisle, Pa. - the Historical Society of Cumberland County, Pennsylvania, October 26, 1917. [Carlisle, Pa.]: Hamilton Library Association.

Bedford, Emeline D. T. The Discovery of Coal in Northeastern Pennsylvania and Life in the Mining Region: Paper Read Before the Hamilton Library Association, Carlisle, Pa. - the Historical Society of Cumberland County, Pennsylvania, October 26, 1917. [Carlisle, Pa.]: Hamilton Library Association, 1918.

Bedford, Emeline D. T. The Discovery of Coal in Northeastern Pennsylvania and Life in the Mining Region: Paper Read Before the Hamilton Library Association, Carlisle, Pa. - the Historical Society of Cumberland County, Pennsylvania, October 26, 1917. [Carlisle, Pa.]: Hamilton Library Association, 1918.