Revision History for USGS Professional Paper 1784-B By Garth E. Graham, Maria Deszcz-Pan, Jared Abraham, and Karen D. Kelley Investigation of the Potential for Concealed Base-Metal Mineralization of the Drenchwater Creek Zn-Pb-Ag Occurrence, Northern Alaska, Using Geology, Reconnaissance Geochemistry, and Airborne Electromagnetic Geophysics ----------------------------------------------------- Posted online at http://pubs.usgs.gov/pp/1784/b/ September 27, 2011 -----------------------------------------------------