 Sunset from SW3 (Southwest Rim) campsite. Big Bend National Park, November 28, 2009
 Group of people with Dallas Sierra Club on Southeast Rim. Big Bend National Park, November 27, 2009
 Group of people with Dallas Sierra Club on Pinnacles Trail. Big Bend National Park, November 26, 2009
 Santa Elena Canyon and mountains in Mexico from SW3 (Southwest Rim) campsite at sunrise. Big Bend National Park, November 29, 2009
 Dallas Sierra Club on Smokey Creek Trail at rain. Big Bend National Park, Texas, November 24, 2007
 Group from Dallas Sierra Club walking north-west from Yapashi in Bandelier National Monument. New Mexico, near Los Alamos, May 25, 2008
 A group of people from Dallas Sierra Club near Macey Lake Trail in Sangre de Cristo Mountains. Colorado, July 2, 2007
 Emory Peak from lower section of Southwest Rim Trail. Big Bend National Park, November 28, 2009
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 - dayhike to Lake Ray Roberts with Dallas Sierra Club 5/31/97 (Dallas, May 18 - 31, 1997)
 People from Dallas Sierra Club west from Horn Creek Ranch in Sangre de Cristo Mountains. Colorado, July 1, 2007
 Fresno Circle campsite near Dodson Trail at evening. Big Bend National Park, Texas, November 23, 2007
 South Rim, view from Fresno Circle campsite near Dodson Trail. Big Bend National Park, Texas, November 23, 2007
 Group of soldiers in a campsite at third annual 8th Texas Rangers and Artillery Reenactment (Battle for El Camino Real) at Lake Madison. Madisonville, Texas, February 7, 2009
 Southeast Rim in fog. Big Bend National Park, November 27, 2009
 Agaves on South Rim. Big Bend National Park, November 28, 2009
 Dry tree on South Rim. Big Bend National Park, November 28, 2009
 Dry juniper on South Rim. Big Bend National Park, November 28, 2009
 Cliffs of South Rim. Big Bend National Park, November 28, 2009
 Some brittlestem (Psathyrella) mushrooms near a primitive campsite a sharp bend of the creek near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, November 12, 2023
 Pine tree on South Rim. Big Bend National Park, November 28, 2009
 Cacti and agaves on South Rim. Big Bend National Park, November 28, 2009
 Boot Spring Trail. Big Bend National Park, November 26, 2009
 Emory Peak Trail in fog. Big Bend National Park, November 27, 2009
 Agaves on South Rim at sunrise. Big Bend National Park, November 29, 2009
 Underside of some brittlestem (Psathyrella) mushrooms near a primitive campsite a sharp bend of the creek near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, November 12, 2023
 Crooked pine growing on South Rim. Big Bend National Park, November 28, 2009
 Upper part of Boot Canyon. Big Bend National Park, November 27, 2009
 Dry juniper tree on South Rim at morning. Big Bend National Park, November 29, 2009
 Elephant tusk Mountain from Southeast Rim. Big Bend National Park, November 28, 2009
 Crooked pine on South Rim at morning. Big Bend National Park, November 29, 2009
 Fall colors of Boot Canyon. Big Bend National Park, November 27, 2009
 Switchbacks of Blue Creek Trail. Big Bend National Park, November 29, 2009
 East summit of Emory Peak in fog. Big Bend National Park, November 27, 2009
 Small greyling mushrooms Tephrocybe anthracophila on old bonfire site on a primitive campsite a sharp bend of the creek near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, November 12, 2023
 Slopes of Chisos Mountains from Pinnacles Trail. Big Bend National Park, November 26, 2009
 Most photographed spot with a pine tree on South Rim. Big Bend National Park, November 28, 2009
 Area of red rocks on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Upper section of Boot Canyon Trail. Big Bend National Park, November 27, 2009
 Elephant Tusk Mountain from South Rim at sunrise. Big Bend National Park, November 29, 2009
 Boot Canyon Trail ending at Southeast Rim. Big Bend National Park, November 27, 2009
 Upper part of Boot Canyon Trail. Big Bend National Park, November 27, 2009
 Fall colors of Chisos Mountains from Pinnacles Trail. Big Bend National Park, November 26, 2009
 Cliffs of Toll Mountain from Boot Spring Trail. Big Bend National Park, November 26, 2009
 Slopes of Chisos Mountains from Boot Spring Trail. Big Bend National Park, November 26, 2009
 Fruit of cholla cactus (cylindropuntia) on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Century plant which bloomed, died, and tipped over, on Pinnacles Trail. Big Bend National Park, November 26, 2009
 Slopes of Chisos Mountains east from Boot Spring Trail. Big Bend National Park, November 27, 2009
 One of eroded pinnacles of pink volcanic tuff on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Sandy washes of Blue Creek Canyon near Homer Wilson Ranch. Big Bend National Park, November 29, 2009
 Fruits of Texas madrone (Arbutus xalapensis) on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Alligator watching tourists on west shore of Elm Lake in Brazos Bend State Park. Needville, Texas, April 24, 2010
 Eroded pinnacles of pink volcanic tuff looking like a miniature Bryce Canyon on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Boot Rock from Boot Spring Trail. Big Bend National Park, November 28, 2009
 View of Boot Rock from Boot Spring Trail. Big Bend National Park, November 27, 2009
 Drooping juniper (Juniperus flaccida Var. flaccida) on Southeast Rim. Big Bend National Park, November 28, 2009
 Boot Rock, view from Boot Spring Trail. Big Bend National Park, November 27, 2009
 Boot Rock from Boot Spring Trail at sunrise. Big Bend National Park, November 28, 2009
 East summit of Emory Peak, with north summit visible in fog. Big Bend National Park, November 27, 2009
 Casa Grande Peak of Chisos Mountains from Emory Peak Trail. Big Bend National Park, November 27, 2009
 Spicewood Springs in Colorado Bend State Park. Bend, Texas, May 23, 2009
 Under Gorman Falls in Colorado Bend State Park. Bend, Texas, May 23, 2009
 Gorman Falls in Colorado Bend State Park. Bend, Texas, May 23, 2009
 Gorman Falls (view from a trail) in Colorado Bend State Park. Bend, Texas, May 23, 2009
 Mossy travertine formations at the base of Gorman Falls in Colorado Bend State Park. Bend, Texas, May 23, 2009
 Country Club golf course in northern Fall River at sunset. Massachusetts, March 15, 2003.
 - Dallas, 10/28/97 (Dallas - a trip to Caprock Canyons State Park, October 28 - November 1, 1997)
 - Dallas, 10/28/97 (Dallas - a trip to Caprock Canyons State Park, October 28 - November 1, 1997)
 QNHG (Qatar Natural History Group) watching birds on a small peninsula. Ruwais, Northern Qatar, April 3, 2015
 Watching birds with QNHG (Qatar Natural History Group) near Abu Nakhla wastewater treatment ponds. Doha, Qatar, March 29, 2014
 - in Highland Park, Dallas (Caprock Canyons State Park - Dallas, November 2 - 8, 1997)
 - in Highland Park, Dallas (Caprock Canyons State Park - Dallas, November 2 - 8, 1997)
 Pour-off of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Fresno Spring at evening. Big Bend National Park, Texas, November 23, 2007
 Ruins of Dodson Ranch. Big Bend National Park, Texas, November 23, 2007
 Canyon of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Group of baby alligators on west side of 40 Acre Lake in Brazos Bend State Park. Needville, Texas, April 22, 2008
 Crowds watching Day of the City parade on Nevsky Prospect from steps of Duma Watchtower. Saint Petersburg, Russia, May 30, 2009
 Agave on Smokey Creek Trail. Big Bend National Park, Texas, November 24, 2007
 Cactus on rocks of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Maiden ferns at Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Large group of domecap mushrooms Lyophyllum fumosum (Lyophyllum decastes species group) on the middle of a mowed grassy path on Pitcher Plant Trail in Big Thicket National Preserve. Warren, Texas, November 23, 2019
 - downtown Dallas, Nov. 15, 16 (Dallas - West Lafayette, November 10 - 22, 1997)
 - downtown Dallas, Nov. 15, 16 (Dallas - West Lafayette, November 10 - 22, 1997)
 - downtown Dallas, Nov. 15, 16 (Dallas - West Lafayette, November 10 - 22, 1997)
 - downtown Dallas, Nov. 15, 16 (Dallas - West Lafayette, November 10 - 22, 1997)
 - downtown Dallas, Nov. 15, 16 (Dallas - West Lafayette, November 10 - 22, 1997)
 Mule Ear Peaks from Smokey Creek Trail. Big Bend National Park, Texas, November 25, 2007
 Cacti on east part of Dodson Trail. Big Bend National Park, Texas, November 23, 2007
 Lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
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