Alan Cressler:
Penstemon parryi, Aquirre Lake, Buenos Aires National Wildlife Refuge, Pima County, Arizona 1
Alan Cressler:
penstemon parryi, aquirre lake, buenos aires national wildlife refuge, pima county, arizona 2
Alan Cressler:
Petrified Logs, Petrified Forest National Park, Apache County, Arizona 2
Alan Cressler:
Petrified Wood, Petrified Forest National Park, Apache County, Arizona 1
Alan Cressler:
phacelia distans, arivaca wash, buenos aires national wildlife refuge, pima county, arizona 1
Alan Cressler:
Santa Rita Mountains, from a Small Cave, Patagonia Mountains, Santa Cruz County, Arizonaz 1
Alan Cressler:
Seven Falls, Pusch Ridge Wilderness, Coronado National Forest, Santa Catalina Mountains, Pima County, Arizona 1
Alan Cressler:
Seven Falls, Pusch Ridge Wilderness, Coronado National Forest, Santa Catalina Mountains, Pima County, Arizona, Warren Genett 1
Alan Cressler:
Seven Falls, Pusch Ridge Wilderness, Coronado National Forest, Santa Catalina Mountains, Pima County, Arizona 1
Alan Cressler:
Cylindropuntia bigelovii, Sonoran Desert, Tucson Mountain Park, Pima County, Arizona 1
Alan Cressler:
Sonorella danielsi (mating), Curtain Cave, Bear Canyon, Huachuca Mountains, Coronado National Forest, Cochise County, Arizona 1
Alan Cressler:
Helictite, Sphinx Cave, Coronado National Forest, Cochise County, Arizona 1
Alan Cressler:
Anthodite, Sphinx Cave, Coronado National Forest, Cochise County, Arizona 1
Alan Cressler:
Stachys coccinea, Yanks Canyon, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Stachys coccinea, Yanks Canyon, Coronado National Forest, Santa Cruz County, Arizona 2
Alan Cressler:
Sunrise, from Sawmill Canyon, Santa Rita Mountains, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Sunset, over the Santa Rita Mountains, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
sycamore canyon pajarita wilderness coronado national forest santa cruz co az 1
Alan Cressler:
Tanque Verde Falls, Coronado National Forest, Pima County, Arizona, Brent Aulenbach, Paul Aughey, Nancy Aulenbach 1
Alan Cressler:
The Grotto, Cave Creek Canyon, Chiricahua Mountains, Coronado National Forest, Cochise County, Arizona, Philip Rykwalder 1
Alan Cressler:
thunderstorm in the desert west of phoenix la paz co az 1
Alan Cressler:
Cave Dwellings, Tonto National Monument, Lower Shelter, Gila County, Arizona 1
Alan Cressler:
trees near a camp fire, coconino national forest, coconico county, arizona 1
Alan Cressler:
Trimorphodon biscutatus lambda, Santa Rita Mountains, Madera Canyon, Santa Cruz, County, Arizona 1
Alan Cressler:
Washingtonia filifera, Palm Canyon, Kofa Natinal Wildlife Refuge, Yuma County, Arizona 2
Alan Cressler:
Yucca Brevifolia, Mohave County, Arizona 1