Yellowstone National Park, Wyoming, 1956 Summer Internship of 1956 View fullsize Bison at Gibbon River, July 1956 View fullsize Bull Elk at Firehole River, 26 July 1956 View fullsize National Park Mountain from Purple Mountain, July 1956 View fullsize Lower Yellowstone Falls from Artist Point, July 1956 View fullsize Lower Yellowstone Falls, July 1968 View fullsize Gibbon Falls, July 1956 View fullsize Virginia Cascade, July 1956 View fullsize Tower Falls July 1956 View fullsize Punch Bowl Spring, July 1956 View fullsize Mammoth Springs, 28 July 1956 View fullsize Norris Geyser Basin, 2 July 1956 View fullsize Golden Gate, 23 July 1956