The Martinsburg formation (Middle and Upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey : a clarification of the stratigraphy of clastic rocks of Middle and Late Or...

by Drake, Avery Ala, 1927-
[Washington] : U.S. Govt. Print. Off., 1967

Annual report on the Geological Survey of Pennsylvania.

Harrisburg, 1836

The geology of Lawrence County : to which is appended a special report on the correlation of the Coal measures of Western Pennsylvania and Eastern Ohio /

by White, I. C. (Israel Charles), 1848-1927
Harrisburg, [Pa.] : Published by the Board of Commissioners for the Second Geological Survey, 1879

Geological maps of Schuylkill, Carbon, Berks and Dauphin counties. : Topographical map of the Blue mountain at Port Clinton, in two sheets.

[Harrisburg?] : Published by the geological survey of Pennsylvania, 1891

Map showing the course of the great terminal moraine across Pennsylvania /

[Harrisburg, Pa.] : Lane S. Hart, State Printer, 1881

Geological map of Lancaster County /

[Harrisburg, Pa.] : Lane S. Hart, State Printer, 1878

The geology of Pennsylvania; a government survey /

Philadelphia : J.B. Lippincott & co., 1858

The geology of Pennsylvania /

Harrisburg, Pa. : Pittsburgh, Pa. : Pennsylvania Geological Survey ; Pittsburgh Geological Society, 1999