Alan Cressler:
Eschscholzia californica subsp. mexicana, Arivaca Wash, Buenos Aires National Wildlife Refuge, Pima County, Arizona 1
Alan Cressler:
Eschscholzia californica subsp. mexicana, Arivaca Wash, Buenos Aires National Wildlife Refuge, Pima County, Arizona 2
Alan Cressler:
Brent Aulenbach, Fantasy Island (Mountain Bike Trails), Tucson, Pima County, Arizona 1
Alan Cressler:
Paul Aughey, Fantasy Island (Mountain Bike Trails), Tucson, Pima County, Arizona 1
Alan Cressler:
Floodwater Cave, Paige Creek Canyon, Cochise County, Arizona, Julie Hudson 1
Alan Cressler:
Fouquieria splendens, Saguaro National Park, Tuscon Mountain Unit, Red Hills Area, Pima County, Arizona 1
Alan Cressler:
Fouquieria splendens, Saguaro National Park, Tuscon Mountain Unit, Red Hills Area, Pima County, Arizona 2
Alan Cressler:
Apache Pictographs, Garden Canyon Pictograph Shelter No. 1, Garden Canyon, Huachuca Mountains, Fort Huachuca, U.S. Army, Cochise County, Arizona 1
Alan Cressler:
Glandularia gooddingii, Arivaca Wash, Buenos Aires National Wildlife Refuge, Pima County, Arizona 1
Alan Cressler:
Graptopetalum bartramii, Sycamore Canyon, Pajarito Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Prehistoric Petroglyphs, Hohokam Period, King Canyon, Saguaro National Park, Tucson Mountains Section, Pima County, Arizona 1
Alan Cressler:
Lake Mohave, Colorado River, Lake Mead National Recreation Area, Clark County, Nevada and Mohave County, Arizona 1
Alan Cressler:
Lampropeltis pyromelana pyromelana, Garden Canyon, Huachuca Mountains, Coronado National Forest, Cochise County, Arizona 1
Alan Cressler:
Larrea tridentata, Rest Area, Interstate 10, South Bound, Gila River Indian Reservation, Pinal County, Arizona 1
Alan Cressler:
Larrea tridentata, Saguaro National Park, Tuscon Mountains Unit, Red Hills Area, pima county, arizona 1
Alan Cressler:
Lemmon Rock Lookout, Catalina Mountains, Coronado National Forest, Pima County, Arizona, Alan Cressler, Nancy Aulenbach, Brent Aulenbach, Paul Aughey 1
Alan Cressler:
Lenticular Clouds, over the Patagonia Mountains, Santa Cruz County, Arizona 1
Alan Cressler:
Lesquerella species, Overlook on U.S. 89A, Coconino County, Arizona 1
Alan Cressler:
Lesquerella species, Overlook on U.S. 89A, Coconino County, Arizona 2
Alan Cressler:
Little Colorado River, Grand Canyon National Park, Coconino County, Arizona, Paul Aughey 1
Alan Cressler:
Lupinus sparsiflorus, Arivaca Wash, Buenos Aires National Wildlife Refuge, Pima County, Arizona 2
Alan Cressler:
Colorado River. Marble Canyon Rapid, Grand Canyon National Park, Coconino County, Arizona 1
Alan Cressler:
Monsoon Thunderstorm, over Dragoon Mountains, from Tombstone, Cochise County, Arizona 1
Alan Cressler:
Morning Glory Cave, Huachuca Mountains, Coronado National Forest, Cochise County, Arizona, Brian Coffey 1
Alan Cressler:
Opuntia basilaris, East of Kingman, Mohave County, Arizona 1
Alan Cressler:
Opuntia engelmannii, Saguaro National Park, Tuscon Mountains Unit, Red Hills Area, Pima County, Arizona 2
Alan Cressler:
Papilio rutulus, Sycamore Canyon, Pajarito Wilderness, Coronado National Forest, Santa Cruz County, Arizona 1
Alan Cressler:
Parkinsonia florida, Rest Area, Interstate 10, South Bound, Gila River Indian Reservation, Pinal County, Arizona 1
Alan Cressler:
Parkinsonia florida, Rest Area, Interstate 10, South Bound, Gila River Indian Reservation, Pinal County, Arizona 2
Alan Cressler:
Patagonia Bat Cave, Coronado National Forest, Santa Cruz County, Arizona, Alan Cressler 1
