6 Caspar David Friedrich Tree Studies | 1 May–2 June 1809 Pencil, 360 × 259 mm | Staatsgalerie Stuttgart, Graphische Sammlung, inv. C 1922/131 (G 584) 7 Caspar David Friedrich Tree Studies and Park Landscape Dresden Sketchbook of 1807–1812, sheet 3 | CAT 97 (G 557) 8 Caspar David Friedrich Tree and Plant Studies Dresden Sketchbook of 1807–1812, sheet 11 14 May 1808 | CAT 97 (G 565) 9 Caspar David Friedrich Study of a Willow, Study of Two Branches 18 April–2 June 1809 | CAT 102 10 Caspar David Friedrich Forest, Krippen Disbound Krippen Sketchbook | 20 July 1813 | CAT 128 8 9 10
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