The geological story of Pennsylvania
By: by John H. Barnes and W.D. Sevon
Contributors: Sevon, William D; Willard, Bradford, b. 1894.
Edition: 2nd ed
Series: Educational series -- 4; Educational series (Pennsylvania. Bureau of Topographic and Geologic Survey) --  no. 4
Publisher: Commonwealth of Pennsylvania, Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey
Published: 1996
Place of publication: Harrisburg
Language: eng
Number of pages: 44
Subjects: Geology -- Pennsylvania -- Popular works
Genres: Popular works
Notes: "January 1996"--T.p. verso

First ed. published as: Pennsylvania geology summarized / by Bradford Willard. Harrisburg : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geologic Survey, 1962. (Educational series (Pennsylvania. Bureau of Topographic and Geologic Survey) ; 4)