Cover for publication SP-58 (Land of Ice) by Vince Matthews. SP-58 Land of Ice: Jaunts Into Colorado’s Glacial Landscape
OF-15-06 Geologic Map of the Crawford Quadrangle OF-15-06 Geologic Map of the Crawford Quadrangle, Delta and Montrose Counties, Colorado
SP-52 Messages in Stone: Colorado's Colorful Geology (2nd Edition) SP-52 Messages in Stone: Colorado’s Colorful Geology (2nd Edition)