TY - BOOK TI - Publication. Field Museum of Natural History Geological series VL - v.6:no.24 (1939) UR - https://www.biodiversitylibrary.org/item/25250 PB - The Museum CY - Chicago, U.S.A PY - 1939 SN - 0376-1711 AU - Field Museum of Natural History. KW - Geology ER -