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Petrified forest, south of Adamano, Ariz., late 1890s or early 1900s

Petrified forest, south of Adamano, Ariz., late 1890s or early 1900s

Man in Connell's Quarry, Iowa, early 1890s or late 1900s

Man in Connell's Quarry, Iowa, early 1890s or late 1900s

Hill showing Carboniferous, Mena, Ark., late 1890s or early 1900s

Hill showing Carboniferous, Mena, Ark., late 1890s or early 1900s

Big Fork Hotel and Post Office, Mena, Ark., late 1890s or early 1900s

Big Fork Hotel and Post Office, Mena, Ark., late 1890s or early 1900s

Carboniferous, Mena, Ark., late 1890s or early 1900s

Carboniferous, Mena, Ark., late 1890s or early 1900s

Mena

Shale exposure east of Mena, Ark., late 1890s or early 1900s

Shale exposure east of Mena, Ark., late 1890s or early 1900s

E

Waterfall, Mena, Ark., late 1890s or early 1900s

Waterfall, Mena, Ark., late 1890s or early 1900s

Located east of Mena, Ark.

Carboniferous, Mena, Iowa, late 1890s or early 1900s

Carboniferous, Mena, Iowa, late 1890s or early 1900s

Located east of Mena, Ark.

Carboniferous, Mena, Ark., late 1890s or early 1900s

Carboniferous, Mena, Ark., late 1890s or early 1900s

Located east of Mena, Ark.

Geological excursion at Harper's Ferry, Va., late 1890s or early 1900s

Geological excursion at Harper's Ferry, Va., late 1890s or early 1900s