Highway geology, Philadelphia to Pittsburgh,
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.
gs 39000356
Geology--Pennsylvania.
QE157 / .W53
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.
gs 39000356
Geology--Pennsylvania.
QE157 / .W53