00905cam a22002411 4500 gs 39000356 DLC 20260227111345.0 770602s1939 pauab 000 0 eng c gs 39000356 (OCoLC)3012184 U.S. Geol. Survey. Library OT DLC QE157 .W53 Willard, Bradford, 1894- Highway geology, Philadelphia to Pittsburgh, by Bradford Willard. Harrisburg, Pa., Department of internal affairs, Topographic and geologic survey, 1939. 2 p.l., 42 p. illus., 2 maps (1 fold.) fold. tab. 23 cm. Bulletin G, 12 At head of title: Pennsylvania Geological survey, Fourth series. On cover: Commonwealth of Pennsylvania. Department of internal affairs. "References": p. 27-28. Geology Pennsylvania. 27592 27592