TY - BOOK ID - 137094061 TI - The ancient volcanic rocks of South Mountain, Pennsylvania PY - 1896 PB - Washington : G.P.O., DB - UniCat KW - Petrology KW - Igneous rocks. KW - Crystallography. KW - Rocks KW - Analysis. KW - Pennsylvania. KW - Petrology. UR - https://www.unicat.be/uniCat?func=search&query=sysid:137094061 AB - ER -