1. Map showing geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1⁰?x 2⁰?quadrangle, Montana and Idaho Yale Public content 1989. 2002-06-01T04:00:00Z. 2004-04-05T13:35:57Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Montana and Idaho.