1872|Gray, Ormando Willis; Walling, H. F.1:300 000
Profiles of Massachusetts Railroad, Florida Canal...
1834|Tanner, Henry S.
Jefferson, Clarion, Indiana, Armstrong counties.
1872|Gray, Ormando Willis; Walling, H. F.1:300 000
Coal, Iron, and Oil; or, the Practical American miner. A plain and popular work on our mines and mineral resources ... With numerous maps and engravings, etc
1866|DADDOW, Samuel Harries and BANNAN (Benjamin)
Plate G. Southwest Pennsylvania.
1871|Hopkins, G.M.
Plate D. West Central Pennsylvania.
1871|Hopkins, G.M.
Somerset, Bedford, Fulton counties.
1872|Gray, Ormando Willis; Walling, H. F.1:300 000