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| | Pennsylvania Geological Survey: Map 61 |
 | | Map 54 *Augmented by Becher, A. (1991), Groundwater resources in and near the anthracite basins of Schuylkill and adjacent counties, Pennsylvania, Pennsylvania Geological Survey, 4th ser., Water Resource Report 64, 59 p. |
 | | Map 57 *Augmented by Becher, A. (1991), Groundwater resources in and near the anthracite basins of Schuylkill and adjacent counties, Pennsylvania, Pennsylvania Geological Survey, 4th ser., Water Resource Report 64, 59 p. |
 | | Map 59 *Augmented by Becher, A. and Taylor, L. (1982), Groundwater resources in the Cumberland and contiguous valleys of Franklin County, Pennsylvania, Pennsylvania Geological Survey, 4th ser., Water Resource Report 53, 67 p. |
| www.dcnr.state.pa.us /topogeo/map61/glossaryB.aspx (1439 words) |
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