TY - MAP ID - 135344592 TI - Map of the Madonna mine, Monarch, Colorado, showing the general geology of level 6, mine workings below level 6, and main ore bodies PY - 1964 PB - Washington (D.C.) U.S. Geological Survey DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:135344592 AB - ER -