Data Sources

Scientific Paper

  • Ripple, William J. and Robert L. Beschta. Restoring Yellowstone's aspen with wolves. Biological Conservation 138, 514-519 (2007).

Data and Images

  • The world, September 2004 (Blue Marble: Next Generation, satellite: NASA Terra/Aqua, sensor: MODIS)
  • Lamar Valley (satellite: NASA Terra, sensor: ASTER)
  • Aerial photos (Eric Larsen/William Ripple, Oregon State University)
  • Aspen (Robert Beschta)
  • Elk (Jim Peaco, National Park Service)
  • Wolf (Gary Kramer/USFWS)