TY - BOOK TI - Publication. Field Museum of Natural History Geological series VL - v.7:no.7 (1949) UR - https://www.biodiversitylibrary.org/item/21460 PB - The Museum CY - Chicago, U.S.A PY - 1949 SN - 0376-1711 AU - Field Museum of Natural History. KW - Geology ER -