Hudson Towards Fishkill Landing, 1871 (from Sketchbook)

Hudson Towards Fishkill Landing, 1871 (from Sketchbook)

Daniel Huntington

Sketch of Rocky Cliffside (from Sketchbook X)

William Trost Richards

Trees and Cliff (from Sketchbook X)

William Trost Richards

Fishkill Mountain, 1871 (from Sketchbook)

Daniel Huntington

Fishkill Mountain, 1871 (from Sketchbook)

Daniel Huntington

Mountain Sketch (from Sketchbook X)

William Trost Richards

Landscape with Forest, Fields, and Mountains (from Sketchbook X)

William Trost Richards

Et stort træ

P.C. Skovgaard

To slanke træer

P.C. Skovgaard

Skovinteriør

P.C. Skovgaard

Studie af en trætop

Caspar David Friedrich

Et træ

P.C. Skovgaard