00913cam a22002771i 4500 gs 05000702 DLC 20260227111301.0 790606s1896 dcubf b f000 0 eng gs 05000702 (OCoLC)5039780 DLC ICharE DLC n-us-pa QE75 .B9 no. 136 QE461 .B3 Bascom, F. (Florence), 1862-1945. The ancient volcanic rocks of South mountain, Pennsylvania / by Florence Bascom. Washington, Govt. Print. Off., 1896. 124 p. : xxviii pl. (incl. maps) ; 24 cm. U.S. Geological survey. Bulletin no. 136 Bibliography : p. 19. "Literature" : p. 87-91. Petrology Pennsylvania. Igneous rocks Pennsylvania. United States. Geological Survey. Bulletin ; 136. 24268 24268