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

1966

O'Brien, Emmett J

1:250k

Harrisburg, Williamsport, Erie, Scranton.

1890

Mitchell, Samuel Augustus

Harrisburg, Williamsport, Erie, Scranton.

1886

Mitchell, Samuel Augustus

Harrisburg, Williamsport, Erie, Scranton.

1884

Mitchell, Samuel Augustus Jr.

An Historical Map of York County, Pennsylvania.

1932

Tunis, Edwin, 1897-1973

Schuylkill County.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Profiles of Massachusetts Railroad, Florida Canal...

1834

Tanner, Henry S.

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

1872

Gray, Ormando Willis; Walling, H. F.

1:300k

Plate J. Southeast Pennsylvania.

1871

Hopkins, G.M.

Cumberland, Franklin, Adams counties.

1872

Gray, Ormando Willis; Walling, H. F.

1:300k