TY - BOOK AU - Hobbs,S.W.(Samuel Warren) AU - Hays,William Henry TI - Ordovician and older rocks of the Bayhorse Area, Custer County, Idaho PY - 1990/// CY - Denver PB - U. S. Geological Survey KW - Geology, stratigraphic KW - Ordovician KW - Geology KW - Idaho KW - Custer County N1 - detailed descriptions and columnar sections of the major stratigraphic ER -