Alan Cressler:
Adiantum capillus-veneris, Cueva Larga, Big Bend Ranch State Park, Presidio County, Texas 1
Alan Cressler:
Adiantum capillus-veneris, Ojito Adentro, Bofecillos Canyon, Big Bend Ranch State Park, Presidio County, Texas 1
Alan Cressler:
Agave havardiana, Davis Mountains, Foothills, along Highway 118, Presidio County, Texas 1
Alan Cressler:
Agave havardiana, Davis Mountains, Foothills, along Highway 118, Presidio County, Texas 2
Alan Cressler:
Aguja Formation, Late Cretaceous age, Concretions, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Aguja Formation, Late Cretaceous age, Concretions, Big Bend National Park, Brewster County, Texas 2
Alan Cressler:
Aguja Formation, Late Cretaceous age, Concretions, Big Bend National Park, Brewster County, Texas 3
Alan Cressler:
Aguja Formation, Prehistoric Petroglyphs, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 2
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 2 Enhanced
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 3
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 3 Enhanced
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 4
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 5
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 5 Enhanced
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 6
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 8
Alan Cressler:
Aguja Formation, Prehistoric Pictographs, Big Bend National Park, Brewster County, Texas 9
Alan Cressler:
Ariocarpus fissuratus, Fresno Canyon, Big Bend Ranch State Park, Presidio County, Texas 1
Alan Cressler:
Ariocarpus fissuratus, Fresno Canyon, Big Bend Ranch State Park, Presidio County, Texas 2
Alan Cressler:
Ariocarpus fissuratus, Fresno Canyon, Big Bend Ranch State Park, Presidio County, Texas 3
Alan Cressler:
Boquillas Canyon Area, Rio Grande, Big Bend National Park, Brewster County, Texas, and Natural Protegida Maderas del Carmen, Coahuila, Mexico 1
Alan Cressler:
Boquillas Formation, and Buda Limestone, Late Cretaceous age, Mania Arriba, Big Bend Ranch State Park, Presidio County, Texas 1
Alan Cressler:
Cane Hot Spring, Big Bend National Park, Brewster County, Texas, Russell McLester and Alan Cressler 1
Alan Cressler:
Chihuahuan Desert, and Chisos Mountains, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Chihuahuan Desert, and Chisos Mountains, Ernst Wash, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Chisos Formation, Alamo Creek Basalt Member, Eocene age, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Chisos Formation, Alamo Creek Basalt Member, Eocene age, Big Bend National Park, Brewster County, Texas 2
Alan Cressler:
Chisos Mountains, The Window, and Cattail Canyon, from Cattail Wash Fan, Big Bend National Park, Brewster County, Texas 1
