TY - BOOK TI - Changes in stratigraphic nomenclature by the U.S. Geological Survey T3 - Contributions to stratigraphy CY - PB - PY - 1970 PY - 1970 LA - English SN - 0193-0214 UR - https://katalog.ub.tu-freiberg.de/Record/0-1151873241 ER -