Folded Structure. Harrisburg, PA. Geologic Map of Harrisburg, PA.

1966

O'Brien, Emmett J

1:250k

Harrisburg, Williamsport, Erie, Scranton.

1886

Mitchell, Samuel Augustus

Cumberland, Franklin, Adams counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

An Historical Map of York County, Pennsylvania.

1932

Tunis, Edwin, 1897-1973

Schuylkill County.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Huntingdon, Juniata, Mifflin, Perry counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Profiles of Massachusetts Railroad, Florida Canal...

1834

Tanner, Henry S.

Plate H. South Central Pennsylvania.

1871

Hopkins, G.M.

Chester, Dauphin, Berks, Lebanon, York, Lancaster counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Plate J. Southeast Pennsylvania.

1871

Hopkins, G.M.