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Shades and shadows (1921)

Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 114

An illustration from Shades and shadows, 1921, leaf 114
X and V are the highest and lowest points of shade Fig. 57 … x^^x^^ is the highestpoint of shade • ^- •^- B L 1 C „ FIG. 58

Shades and shadows · Geometry, Descriptive

Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.

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