1921 - 1926
Desert pave, no vegetation, May 25, 1921
Same desert type, pave, no vegetation, May 25, 1921
Veg. at back, Ironwood, Opuntia, May 26, 1921
Ironwood, annuals on pave, May 26, 1921
C.F. Marbut, May 26, 1921
Desert pave, Covillea, Gaertneria, May 26, 1921
Desert pave, Covillea, Gaertneria, May 26, 1921
Desert pave, soil sampling, May 26, 1921
Ironwood, Palo Verde, on desert, May 26, 1921
Giant cactus, ironwood, Covillea, May 26, 1921
View of desert toward mountains, May 26, 1921
Carnegiea, cholla, Isocoma, May 28, 1921
Detail of Carnegiea, May 28, 1921
Original wall of Casa Grande ruins, May 28, 1921
Casa Grande ruin, May 28, 1921
Grinding stone, pottery at ruin, May 28, 1921
Old compartment of ruin, May 28, 1921
Old comound of ruins, May 28, 1921
View near ruins, vegetation, May 28, 1921
Flower of Carnegiea gigantea, May 29, 1921
Detail of Carnegiea, May 29, 1921
Cholla, Carnegiea, Isocoma, Covillea, typical of large areas, May 29, 1921
Grassland with bear grass, May 31, 1921
Grassland with bear grass, May 31, 1921
Yucca, grassland reduced to weed grass stage, May 31, 1921
View of grassland, Boutelouas, May 31, 1921
Grassland, rocky hilltops, May 31, 1921
Grassland, yucca, agave, bear grass, May 31, 1921
Grass, Bouteloua, hirsuta, general view, May 31, 1921
Grassland with bear grass, Yucca, May 31, 1921
Grassland with bear grass, May 31, 1921
Yucca plants in fruit, May 31, 1921
Yucca eleta on weed grass, May 31, 1921
Over grazed desert grassland, May 31, 1921
Alkali flat, no plants at all, May 31, 1921
Alkali flat, no veg., white alkali, May 31, 1921
Prosopois in flower, June 1, 1921
Yucca elata, Gutierrezia, grass, June 1, 1921
Over grazed grassland with veg., June 1, 1921
Prosopis, Gutierrezia on Mojave loam, June 1, 1921
Prosopis in bloom, June 1, 1921
Pure Covillea, June 2, 1921
Pure Covillea, 11 mi. south, June 2, 1921
Panorama, alfalfa and grain fields with cottonwood along Valley. Covillea, desert shrub on hill, mountains beyond, June 2, 1921
Panorama, alfalfa and grain fields with cottonwood along Valley. Covillea, desert shrub on hill, mountains beyond, June 2, 1921
Panorama, alfalfa and grain fields with cottonwood along Valley. Covillea, desert shrub on hill, mountains beyond, June 2, 1921
Cat's claw in bloom, June 3, 1921
Apache teepee, soil alkali, June 3, 1921
Teepee, cedar tree at right, June 3, 1921
Poa, Bouteloua gracilis, yellow pine, Aspen, Douglas fir, near divide, June 4, 1921
Detail of grassland, pure Bouteloua gracilis, June 4, 1921
Yellow pine, Poa arizonica, June 4, 1921
Yellow pine, Poa arizonica, June 4, 1921
Open area, pure Poa, Pine in back, June 4, 1921
Panorama, oak, cedar, grama grass, yellow pine on mountain in back in the Lincoln National Forest, June 7, 1921
Tree claim recently grazed, September 30, 1922
Detail of ash, young trees killed, September 30, 1922
Typical short grass, October 2, 1922
Soil section, October 3, 1922
Type of soil in columnar struct, October 5, 1922
Type of soil in columnar struct, October 5, 1922
Pure short grass cover, old path, October 5, 1922
Pure short grass cover, old path, showing cattle path, October 5, 1922
Veg. on prairie, October 7, 1922
Profile of soil, October 7, 1922
Shaded, lime occurs 12 inches, October 7, 1922
Natural veg., listed p38 of text, October 7, 1922
Pure buffalo grama sod, reestablish, October 7, 1922
Effect of disking in 1885, as 4, October 7, 1922
Detail of grassland, Muhlenbergia, grama, October 10, 1922
Excellent srtand of Erotia lanata, October 10, 1922
Artemisia tridentata, Detail, September 18, 1925
Skeleton of Artemisia tridentata, September 18, 1925
Chrysothamnus, 3 stem from 1, September 18, 1925
Artemisia tridentata, Detail, prostrate, September 18, 1925
Artemisia tridentata, September 21, 1925
Atriplex nuttallii, Erotia, September 21, 1925
Atriplex nuttallii, Erotia lanata, September 21, 1925
Monroa invading ant yard, September 21, 1925
Artemisia tridentata, September 21, 1925
Rabbit brush replacing sage, September 21, 1925
Detail of old rabbit brush, September 21, 1925
Hilaria jamesii, Aristida, Sage, September 21, 1925
Aristida, Erotia, Hilaria, September 21, 1925
The "outfit", September 21, 1925
Detail of Hilaria Jamesii, September 21, 1925
Detail of Aristida, September 21, 1925
Ant hill, September 21, 1925
Sporobolus cryptandrus, Aristida, September 24, 1925
Sporobolus cryptandrus, Aristida, September 24, 1925
Pure shad, September 24, 1925
Pure shad, September 24, 1925
Skeleton of old shad plant, September 24, 1925
Shad in fore, rabbit brush in back, September 24, 1925
Cleared and abandoned land, September 24, 1925
Chrysothamnus, September 24, 1925
Abandoned ranch, September 24, 1925
Mixed rabbit brush, Sporobolus, sage, September 25, 1925
View over valley, September 25, 1925
Atriplex corrugata, September 25, 1925
Atriplex pabularis, September 25, 1925
Root of Atriplex, September 25, 1925
Shrubby Erigonium, September 25, 1925
Atriplex pabularis, alkali shale, September 25, 1925
Atriplex corrugata, salt, September 25, 1925
Atriplex corrugata, September 25, 1925
Populus, Atriplex, Pseudotsuga, September 27, 1925
Aspen, Douglas, Sage, September 27, 1925
Pinus flexilis, Populus, Artemisia tridentata, September 27, 1925
Pinus, Populus, Artemisia frigida, Artemisia tridentata, September 27, 1925
Ranch on White River, Cedar, Sage, September 28, 1925
Ranch on white river, sage, Juniper, September 28, 1925
Mostly juniper, sage, White R., September 28, 1925
Lake, Lodgepole Pine, willow, September 29, 1925
Pine, snow on trail, September 28, 1925
River, grass, willow, pine, September 29, 1925
Picea, Populus, Douglas Fir, September 29, 1925
Picea Engelmannii, Populus trichocarpa, September 29, 1925
Mountain meadow, lake, spruce, September 29, 1925
Grasses follow cutting of spruce, September 29, 1925
Mountain meadow, spruce, September 29, 1925
Lake Ivanhoe, meadow, September 29, 1925
Lodgepole Pine, grass, stream, September 29, 1925
Lotus, Buckwheat, Ramona, Corn, May 26, 1926
Eriogonum fasciculatum, May 26, 1926
Grassland, May 26, 1926
Grass, Alder and chaparral, May 26, 1926
Making brick, May 26, 1926
Making brick, May 26, 1926
Aesculus californica, May 26, 1926
Aesculus californica, May 26, 1926
Small fern, May 26, 1926
Eriogonum and chaparral, May 26, 1926
Blue mint, Adenostoma, May 27, 1926
View of chaparral, May 27, 1926
Cactus, May 27, 1926
Dudleya, Atriplex, Eriogonum, May 27, 1926
Large cereus on cliffs, May 27, 1926
Large cereus on cliffs, May 27, 1926
Dudleya, May 27, 1926
Franseria, Cereus, Artemisia californica, May 27, 1926
Blue horse mint, Adenostoma, May 27, 1926
Horse mint, Adenostoma, grass, May 27, 1926
Horse mint, Adenostoma, May 27, 1926
Agave in flower, Eriogonum fascoculatum, May 27, 1926
Detail of agave flower, May 27, 1926
Agave, Rhus, Eriogonum fasciculatum, May 27, 1926
View of Adenostoma, oaks, grass, May 27, 1926
Dudleya, Eriogonum fasciculatum, May 27, 1926
Dudleya, Agave, and River, May 27, 1926
Dudleya, Agave, May 27, 1926
Cliff with Dudleya, Agave, May 27, 1926
Cliff, Ocean, Dudleya, Agave, May 26, 1926
Dudleya, agave, May 27, 1926
Detail Dudleya, Agave, May 27, 1926
Dudleya, agave, May 27, 1926
Sand hills, Gaertneria, Croton, May 27, 1926
Gaertneria, Mesembryanthemum, May 27, 1926
Sand dunes, ocean, May 27, 1926
General view of Gaertneria, May 27, 1926
Dune of Sporobolus airoides, June 8, 1926
Dune of Sarcobatus vermiculatus, June 8, 1926
Anogra, Sporobolus airoides, June 8, 1926
Aristida, hummocks, sandy soil, June 8, 1926
Mice, bug, rabbit tracks, June 8, 1926
Tracks, June 8, 1926
Artemisia tridentata, Chrysothamnus, June 8, 1926
Bennetts Ranch, June 17, 1926
Bennetts Ranch, June 17, 1926
Lake, trees, June 22, 1926