Cleaves, Arthur B. 1905- Guidebook to the geology of the Pennsylvania turnpike, by A. B. Cleaves and Geo. H. Ashley. - Harrisburg, Pa., Dept. of Internal Affairs, Topographic and Geologic Survey, 1942. - iv, 37 p. illus. (incl. maps) plates. 23 cm. LCCN: gs 42000209 Subjects--Topical Terms: Geology--Pennsylvania Subjects--Geographic Terms: Pennsylvania Turnpike (Pa.) LC Class. No.: QE157 / .C55 Dewey Class. No.: 557.48