TY - BOOK ID - 132731888 TI - The Twentymile Park district of the Yampa coal field, Routt County, Colorado PY - 1923 PB - Washington USGPO DB - UniCat KW - Rocks. Minerals UR - https://www.unicat.be/uniCat?func=search&query=sysid:132731888 AB - ER -