Alan Cressler:
E.K.'s Cave, Dolan Falls Preserve, The Nature Conservancy, Val Verde County, Texas 1
Alan Cressler:
Cave Kiva, Prehistoric Pictographs, El Paso County, Texas 1
Alan Cressler:
Cave Kiva, Prehistoric Pictographs, El Paso County, Texas 2
Alan Cressler:
Cave Kiva, Prehistoric Pictographs, El Paso County, Texas 4
Alan Cressler:
Cave Kiva, Prehistoric Pictographs, El Paso County, Texas 3
Alan Cressler:
Cave Kiva, Prehistoric Pictographs, El Paso County, Texas 5
Alan Cressler:
Cave Kiva, Prehistoric Pictographs, El Paso County, Texas, Alan Cressler 1
Alan Cressler:
Punkin Cave, Edwards County, Texas, Doug Strait 1
Alan Cressler:
Punkin Cave, Edwards County, Texas, Manuel Beers 1
Alan Cressler:
Punkin Cave, Edwards County, Texas, Manuel Beers and Philip Rykwalder 1
Alan Cressler:
Punkin Cave, Edwards County, Texas, Manuel Beers and Philip Rykwalder 2
Alan Cressler:
Punkin Cave, Edwards County, Texas, Paul Aughey, night shot 1
Alan Cressler:
Terlingua Sinkhole, Terlingua, Brewster County, Texas, Doug Strait 1
Alan Cressler:
Terlingua Sinkhole, Terlingua, Brewster County, Texas, Manuel Beers 2
Alan Cressler:
Terlingua Sinkhole, Terlingua, Brewster County, Texas, Manuel Beers 3
Alan Cressler:
Terlingua Sinkhole, Terlingua, Brewster County, Texas, Manuel Beers 6
Alan Cressler:
Terlingua Sinkhole, Terlingua, Brewster County, Texas, Manuel Beers 7
Alan Cressler:
Terlingua Sinkhole, Terlingua, Brewster County, Texas, Manuel Beers 8