Stratigraphy of the Lower Ordovician Axemann Limestone of central Pennsylvania,

by Lees, John A.
Harrisburg, [Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey] 1967

The Pennsylvanian Mill Creek limestone in Pennsylvania.

by Chow, Minchen Ming, 1920-
[Harrisburg, Pa. Commonwealth of Pennsylvania] Dept. of Internal Affairs, Topographic and Geologic Survey, 1951

Structure and stratigraphy of the limestones and dolomites of Dauphin County, Pennsylvania,

by MacLachlan, David B.
Harrisburg, 1967

Stratigraphy of the Lower Ordovician Axemann Limestone of central Pennsylvania /

by Lees, John A.
Harrisburg : Pennsylvania Geological Survey, 1967