The old Lost Burro Mine, Death Valley, California (near Racetrack Valley).
A desert storm passes over a lonely portion of the Pony Express Trail, south-central Nevada.
Wizard Island in Crater Lake, Oregon.
1973: Mount Saint Helens (Washington State) before the 1980 eruption.
Petrified Forest National Park, near Holbrook in northeastern Arizona. Fossilized log of Sequoia sempervirens (Redwood) tree.
Petrified Forest National Park, near Holbrook in northeastern Arizona. Fossilized log of Sequoia sempervirens (Redwood) tree. June 1982
Petrified Forest National Park, near Holbrook in northeastern Arizona. Fossilized logs of Sequoia sempervirens (Redwood) trees.
Petrified Forest National Park, near Holbrook in northeastern Arizona. Detail of the outer bark of a fossilized log of Sequoia sempervirens (Redwood) tree.
Petrified Forest National Park, near Holbrook in northeastern Arizona.
Erosional feature (a butte) known as The Mitten, the Four Corners region (Arizona, New Mexico, Colorado, & Utah) at Monument Valley.
Erosional features in Monument Valley: The Mitten (foreground), the Four Corners region (Arizona, New Mexico, Colorado, & Utah) at Monument Valley.
My cabin at Yankee Creek (elevation 8,000 feet-plus), near Evergreen, Colorado in the Front Range of the Rocky Mountains. February 1991
The Bunk House: My cabin at Yankee Creek (elevation 8,000 feet-plus), near Evergreen, Colorado in the Front Range of the Rocky Mountains. February 1991
A close-up of The Bunk House: My cabin at Yankee Creek (elevation 8,000 feet-plus), near Evergreen, Colorado in the Front Range of the Rocky Mountains. June 1992
The view from my cabin at Yankee Creek (elevation 8,000 feet-plus), near Evergreen, Colorado in the Front Range of the Rocky Mountains. September 1993
View from the South Rim of the Grand Canyon, the starting point of a week-long hike on the Bright Angel Trail to the bottom of the canyon at Indian Wells, then on to the North Rim of the canyon. 5 march 1972
The first leg of the hike down the Grand Canyon on the Bright Angel Trail. The canyon-bottom portion of the trail (light-colored line on canyon bottom) can be seen in the bottom-right corner of the image. 5 March 1972
The view from the South Rim of the Grand Canyon as I started down the Bright Angel Trail on Day One of my hike to the bottom of the canyon.
Day One of my hike to the bottom of the Grand Canyon. You can see the line of the Bright Angel Trail (bottom-right quadrant of the photo) as it cuts across the last plateau before it drops down into the V-shaped drainage of the Colorado River. 5 March 1972
One-third of the way to the canyon bottom: Day One of my hike to the bottom of the Grand Canyon. 5 March 1972
The air quality of the Grand Canyon was much better in 1972! 5 March 1972
Looking up at the North Rim of the Grand Canyon from Indian Wells near the canyon bottom. 5 March 1972
