Geology and mineral resources of the Mifflintown quadrangle, Pennsylvania /

by Conlin, Richard R.
[Harrisburg] : Department of Internal Affairs, Topographic and Geologic Survey, 1962

Stratigraphy and paleontology of the Bloomsburg formation of Pennsylvania and adjacent States /

by Hoskins, Donald M.
[Harrisburg, PA.] : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey, 1961

Fossil collecting in Pennsylvania /

by Hoskins, Donald M.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Office of Resources Management, Bureau of Topographic and Geologic Survey : Copies purchased from State Book Store, 1983
Third edition.