Alan Cressler:
Acarospora contigua, Emerald Mountain, Glacier Basin, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Alan Cressler, Tomichi Point, Black Canyon of the Gunnison National Park, Montrose County, Colorado 2
Alan Cressler:
Alces alces, Kawuneeche Valley, Rocky Mountain National Park, Grand County, Colorado 1
Alan Cressler:
Allium acuminatum, Black Canyon of the Gunnison National Park, Montrose County, Colorado 1
Alan Cressler:
Allium cernuum, Pike National Forest, Teller County, Colorado 1
Alan Cressler:
Allosaurus (Therapod), Dinosaur Tracks, Jurassic Age, Salt Wash Member of Morrison Formation, Copper Ridge Dinosaur Trackway, BLM, Grand County, Utah 1
Alan Cressler:
alpine lake, Forest Canyon, from Rock Cut area, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Anvil Points Arch, BLM land, Garfield County, Colorado, Elliot Stahl, and Marion Smith 1
Alan Cressler:
Anvil Points Arch, BLM land, Garfield County, Colorado, left to right, Elliot Stahl, Marion Smith, and Joe Douglas 1
Alan Cressler:
Anvil Points Cave, lower entrance, BLM land, Garfield County, Colorado, left to right, Marion Smith, Elliot Stahl, and Joe Douglas 1
Alan Cressler:
Anvil Points Cave, main passage, BLM land, Garfield County, Colorado, Elliot Stahl 1
Alan Cressler:
Anvil Points Cave, upper entrance sink, BLM land, Garfield County, Colorado 1
Alan Cressler:
Anvil Points Cave, upper entrance, BLM land, Garfield County, Colorado, Marion Smith 1
Alan Cressler:
Aquilegia coerulea, Fern Lake Trail, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Aralia nudicaulis, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Aralia nudicaulis, Rocky Mountain National Park, Larimer County, Colorado 2
Alan Cressler:
Baby Arch, Kachina Bridge Trail, Natural Bridges National Monument, San Juan County, Utah, Elliot Stahl 1
Alan Cressler:
Beldon Formation (Lower Pennsylvanian Age), Massive Folds, Lower Sweetwater Creek Canyon, BLM Lands, Eagle County, Colorado 1
Alan Cressler:
Beldon Formation (Lower Pennsylvanian Age), Massive Folds, Lower Sweetwater Creek Canyon, BLM Lands, Eagle County, Colorado 3
Alan Cressler:
Big Thompson River Valley, Moraine Park, Rocky Mountain National Park, Larimer County, Colorado 2
Alan Cressler:
Big Thompson River Valley, Moraine Park, Rocky Mountain National Park, Larimer County, Colorado 4
Alan Cressler:
Big Thompson River, Big Thompson River Valley, Moraine Park, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Big Thompson River, Fern Lake Trail, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Big Thompson River, Fern Lake Trail, Rocky Mountain National Park, Larimer County, Colorado 2
Alan Cressler:
Big Thompson River, Fern Lake Trail, Rocky Mountain National Park, Larimer County, Colorado 3
Alan Cressler:
Big Thompson River, The Pool, Fern Lake Trail, Rocky Mountain National Park, Larimer County, Colorado 1
Alan Cressler:
Birthing Rock, prehistoric rock art, Moab area, Grand County, Utah 2
Alan Cressler:
Black Canyon of the Gunnison, view from Chasm View, Black Canyon of the Gunnison National Park, Montrose County, Colorado 1
Alan Cressler:
Black Canyon of the Gunnison, view from Gunnison Point, Black Canyon of the Gunnison National Park, Montrose County, Colorado 1
Alan Cressler:
Black Canyon of the Gunnison, view from Sunset View, Black Canyon of the Gunnison National Park, Montrose County, Colorado 1
