Guide to the Horse Shoe Curve section between Altoona and Gallitzin, central Pennsylvania
By: Frank M. Swartz
Series: Pennsylvania Topographic and Geologic Survey. General geology report G -- no. 50; Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) -- G no. 50.
Published: 1965
Place of publication: Harrisburg
Language: eng
Number of pages: 56
Subjects: Geology
Notes: "Pennsylvania Geological Survey fourth series."

Bibliography: p. 54-56.