Recent geological history of the Delaware Valley below the Water Gap /
by Freeman Ward.
- Harrisburg, Pa. : Dept. of Internal Affairs, Topographic and Geologic Survey, 1938.
- v, 76 p. : ill., maps ; 23 cm.
- Bulletin G ; 10 .
Includes bibliographical references.
gs 39000031
Geology--Pennsylvania. Geology--Delaware River Valley (N.Y.-Del. and N.J.)