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Boundary Monument 75E, Southeastern Arizona - 1893
A view of Monument 75 looking west toward the San Bernardino Valley and the Perilla Mountains. Cerro Gaillardo stands to the left of the monument. The vegetation is Chihuahuan Desert Grassland that has a scattering of shrubs within it. The smaller shrubs are probably broom snakeweed; the larger shru... 
Boundary Monument 75E, Southeastern Arizona - 1994
During the past century, the grassland has continued to become more shrubby with increases in such plants as broom snakeweed and velvet mesquite. The mesquite, occurring here near the upper limits of its range, has remained short, probably as the result of catastrophic freezes that have visited the ...
Boundary Monument 75E, Southeastern Arizona - 2009
An anti-vehicle barricade has been constructed across this section of the international boundary. Grass cover has increased in the foreground, providing evidence of the site’s grassland connection. (Raymond M. Turner)...
Cliff Palace, Mesa Verde National Park, Colorado - 1891
This view of the south part of Cliff Palace shows some fairly well preserved structures. Built in a large alcove, this is the largest cliff dwelling in the Park, with 22 kivas and more than 150 rooms. Closer to the opening there is more damage, notably to the four-story tower. The structures in fron...
Cliff Palace, Mesa Verde National Park, Colorado - 1989
The kivas, which were unexcavated by Nordenskiöld, are now exposed. Fewkes did considerable repair of the tower, kivas, and other structures when he excavated the ruin in 1909. Paths for visitors have been added to facilitate access. (Bill Howard)....
Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 1902
Ground repeat photography location 233 looking west at Huérfano Butte, at 1,159-meter elevation. In 1902, photographer David Griffiths’ horse-drawn buggy was clearly visible in the open grassland, and scattered desert hackberry plants were behind and on either side of the buggy. (David ...
Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 1941
Members of the 1930s burrowed and cholla eruptions were visible in 1941 as well as new mesquite plants that were already quite large. (Photographer unknown)....
Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 2007
More mesquite were visible, and prickly pear had replaced cholla as the dominant cacti. (Mitchel P. McClaran)....
Muir and Riggs Glaciers, Muir Inlet, Alaska - 1941
This northeast-looking photograph, on the southeastern side of White Thunder Ridge ,shows the lower reaches of Muir Glacier, then a large tidewater calving valley glacier, and its tributary Riggs Glacier. The séracs in the lower right-hand corner of the photograph mark Muir Glacier’s te...
Muir and Riggs Glaciers, Muir Inlet, Alaska - 1950
This, the first of two repeat photographs, documents significant changes that have occurred during the nine years between photographs A and B. Although Muir Glacier has retreated more than 3 kilometers and thinned more than 100 meters, exposing Muir Inlet, it remains connected with tributary Riggs G...
Muir and Riggs Glaciers, Muir Inlet, Alaska - 2004
The second repeat photograph documents significant changes that have occurred during the 63 years between photographs A and C, and during the 54 years between photographs B and C. Muir Glacier has retreated out of the field of view and is now more than 7 kilometers northwest. Riggs Glacier has retre...
San Carlos River near Peridot, Southern Arizona - 1940
In 1940, the gaging station for the San Carlos River was on a railroad bridge south of the little town of Peridot. This downstream view from that bridge shows the gage house on the extreme left and a safety railing next to it. The channel is wide following a flood, and scattered Frémont cotto...
San Carlos River near Peridot, Southern Arizona - 1964
Riparian vegetation has increased to the extent of blocking the downstream view. The channel appears to have shifted to the right, and the terrace is now occupied by cottonwood, black willow, and tamarisk. (Raymond M. Turner)....
San Carlos River near Peridot, Southern Arizona - 2000
The gaging station has been removed, but the approximate position of the original camera can be established from the background mountains. The channel has shifted back to the left, eliminating the cottonwood trees present in 1964, but black willow is obvious in the foreground, cottonwood seedlings a...
Shepard Glacier, Glacier National Park, Montana - 1913
Well-defined boundaries and crevasses are apparent in this photo of Shepard Glacier when its mass filled the cirque in 1913. (W.C. Alden)...
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