Spruce Trunks and Grass, Great Spruce Head Island, Maine, August 10, 1955

Spruce Trees in Fog, Great Spruce Head Island, Maine, August 20, 1954

Senecio and Red Top Grass, Dirego, Maine, August 14, 1954

Violets and Grass, Great Spruce Head Island, Maine, May 31, 1964

Sunrise, Great Spruce Head Island, Maine, July 27, 1963

Blue Violets on Road to Route 129 from Cades Cove, Great Smoky Mountains National Park, Tennessee, April 9, 1968

Rock Face with Small Rhododendrons, Road to Walnut Bottoms, Great Smoky Mountains National Park, Tennessee, April 11, 1968

Birdsfoot Violets, Route 129 to Foothills Parkway, Great Smoky Mountains National Park, Tennessee, April 9, 1968

Forest View from near the Chimneys, Newfound Gap Road, Great Smoky Mountains National Park, Tennessee, April 26, 1968

Trailing Arbutus on Road to Route 129 from Cades Cove, Great Smoky Mountains National Park, Tennessee, April 9, 1968

Shad Tree in Bloom, Walnut Bottom Road, Great Smoky Mountains National Park, Tennessee, April 14, 1968

Moss-covered Stones, Newfound Gap Road, Great Smoky Mountains National Park, Tennessee, April 24, 1968

Black Trunks and New Leaves, Newfound Gap Road, Great Smoky Mountains National Park, Tennessee, April 12, 1968

Hardwood Forest, Congaree, South Carolina, October 28, 1969

Lechuguilla and Wet Rocks, Rough Spring, Big Bend National Park, Texas, November 4, 1978

Decaying Leaves, Congaree, South Carolina, October 27, 1969

Drift Stump and Dead Trees, Cape Meares, Oregon, July 16, 1975

Moss-covered Hemlock, Hoh Rain Forest, Olympic Peninsula, Washington, July 24, 1975

Avalanche Lilies, Mount Rainier, Washington, August 2, 1975

Oak Tree, Smith Spring, Guadalupe Mountains National Park, Texas, May 12, 1977