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Purple limestone of red beds, Chatauqua grounds, Hot Springs, S.D., late 1890s or early 1900s

Purple limestone of red beds, Chatauqua grounds, Hot Springs, S.D., late 1890s or early 1900s

Conglomerate near the "Plunge", Hot Springs, South Dakota, late 1890s or early 1900s

Conglomerate near the "Plunge", Hot Springs, South Dakota, late 1890s or early 1900s

Folded beds of limestone, Buffalo Gap, S.D., late 1890s or early 1900s

Folded beds of limestone, Buffalo Gap, S.D., late 1890s or early 1900s

Professer Thomas H. MacBride seated on petrified log west of Cycad field near Minnekahta, S.D., late 1890s or early 1900s

Professer Thomas H. MacBride seated on petrified log west of Cycad field near Minnekahta, S.D., late 1890s or early 1900s

Folded Triassic limestone, Cascade, S.D., late 1890s or early 1900s

Folded Triassic limestone, Cascade, S.D., late 1890s or early 1900s

Located near Cascade 12 miles South of Hot Springs, South Dakota.
Gorge in Triassic limestone with special forms, southern edge of the Black Hills uplift, Cascade, S.D., late 1890s or early 1800s

Gorge in Triassic limestone with special forms, southern edge of the Black Hills uplift, Cascade, S.D., late 1890s or early 1800s

"The Herald" Mine in Sugar Loaf district, Colorado, late 1890s or early 1900s

"The Herald" Mine in Sugar Loaf district, Colorado, late 1890s or early 1900s

Cascades in Big Thomson Creek at entrance to Willow Park, Estes Park, Colo., late 1890s to early 1900s

Cascades in Big Thomson Creek at entrance to Willow Park, Estes Park, Colo., late 1890s to early 1900s

Estes Park from verandah of Estes Park Hotel, Estes Park, Colorado, late 1890s or early 1900s

Estes Park from verandah of Estes Park Hotel, Estes Park, Colorado, late 1890s or early 1900s

Long's Peak in a Storm, Estes Park, Colorado, 1898

Long's Peak in a Storm, Estes Park, Colorado, 1898