Phacelia, Moss, Fern, Little River, Middle Prong Road, Great Smoky Mountains National Park, Tennessee, April 21, 1968

Balsam Forest, Clingman's Dome, Great Smoky Mountains National Park, Tennessee, May 11, 1968

Spruce Trees in Clouds, Clingman's Dome, Great Smoky Mountains National Park, Tennessee, June 26, 1968

Sun on Brook, Cades Cove Road, Great Smoky Mountains National Park, Tennessee, June 30, 1968

Cow Lakes, near Jordan Valley, Oregon, July 11, 1975

Noctilucent Clouds Over Mount Baker, Washington, July 30, 1975

Noctilucent Clouds Over Mount Baker, Washington

Foxglove, Ecola State Park, Oregon, July 16, 1975

Maples and Firs, Hoh Rain Forest, Olympic Peninsula, Washington, July 24, 1975

Tree and Mountain Valley, Great Smoky Mountains National Park, Tennessee, March 11, 1969

Roadside Spring, Wallowa National Forest, Oregon, July 10, 1975

Firs and Pine Trunk on Road to Halfway, Wallowa National Forest, Oregon, July 10, 1975

Cactus Blossoms, Big Bend National Park, Texas, May 21, 1950

Cactus Blossoms, Big Bend, Texas

Nisqually Glacier, Mount Rainier, Washington, August 2, 1975

Yellow Leaves Over Little River, on Road to Cades Cove, Great Smoky Mountains National Park, Tennessee, October 7, 1967

Yellow Leaves Over Little River, on Road to Cades Cove, Great Smoky Mountains National Park, Tennessee, October 7, 1967

Lichen and Moss, Bull Head Trail, Great Smoky Mountains National Park, Tennessee, October 12, 1967

Beech and Bare Trees, West Prong, Little Pigeon River, Great Smoky Mountains National Park, Tennessee, October 13, 1967

Dogwood, Ramsey Prong Road, Great Smoky Mountains National Park, Tennessee, April 23, 1968