Revision History for
  USGS Scientific Investigations Map 3168

  David A. Williams, Laszlo P. Keszthelyi, David A. Crown,
  Jessica A. Yff, Windy L. Jaeger, Paul M. Schenk,
  Paul E. Geissler, and Tammy L. Becker

  Geologic Map of Io

  -----------------------------------------------------
  Posted online at http://pubs.usgs.gov/sim/3168/
  March 13, 2012

  -----------------------------------------------------