Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 1
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 10
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 2
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 3
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 4
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 5
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 6
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 7
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 8
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee 9
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee, Jan Simek 1
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee, Jan Simek 2
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee, Jan Simek 3
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee, Jan Simek and Paul Aughey 1
Alan Cressler:
Bedrock Mortar Rock, Cumberland County, Tennessee, Paul Aughey 1
Alan Cressler:
Bedrock Mortor, Trapp Site, Alabama 1
Alan Cressler:
Mortar Holes, Santa Cruz County, Arizona 1
Alan Cressler:
Stewart's Cupule Site, Prehistoric Cupules, Union County, Georgia 1
Alan Cressler:
Stewart's Cupule Site, Prehistoric Cupules, Union County, Georgia 2
Alan Cressler:
Indian Head, Mortars, Big Bend National Park, Brewster County, Texas 1
Alan Cressler:
Indian Head, Mortars, Big Bend National Park, Brewster County, Texas 2
Alan Cressler:
Indian Head, Mortars, Big Bend National Park, Brewster County, Texas 3
Alan Cressler:
Indian Head, Mortars, Big Bend National Park, Brewster County, Texas 4
Alan Cressler:
Indian Head, Mortar, Big Bend National Park, Brewster County, Texas, Russell McLester 1
Alan Cressler:
Indian Head, Mortar, Big Bend National Park, Brewster County, Texas, Russell McLester 2
Alan Cressler:
Indian Head, Mortar, Big Bend National Park, Brewster County, Texas, Russell McLester 3
Alan Cressler:
Rio Grande, Mortars, Boquillas Canyon Area, Big Bend National Park, Brewster County, Texas, and Natural Protegida Maderas del Carmen, Coahuila, Mexico 1