Clough & Kimball, 1870-1871, Entrance to the Observatory - Clough, Smith and Nelson. [Mt. Washington, N.H.], [Views taken on The Summit of Mt. Washington during The Winter of 1870-71], Stereocard, J. Paul Getty Museum, LL/98284

Clough & Kimball, 1870-1871, Frost and Clouds. [Mt. Washington, N.H.], [Views taken on The Summit of Mt. Washington during The Winter of 1870-71], Stereocard, J. Paul Getty Museum, LL/98281

Clough & Kimball, 1870-1871, Interior of the Observatory - Messrs. Clough, Smith and Nelson. [Mt. Washington, N.H.], [Views taken on The Summit of Mt. Washington during The Winter of 1870-71], Stereocard, J. Paul Getty Museum, LL/98283

Clough & Kimball, 1870-1871, Miniature Frost Feathers on rocks. [Mt. Washington, N.H.], [Views taken on The Summit of Mt. Washington during The Winter of 1870-71], Stereocard, J. Paul Getty Museum, LL/98286

Clough & Kimball, 1870-1871, Sea of Clouds, mountain tops protruding. [Mt. Washington, N.H.], [Views taken on The Summit of Mt. Washington during The Winter of 1870-71], Stereocard, J. Paul Getty Museum, LL/98285