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Shades and shadows (1921)
Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 111
Fig. 54 HS ! HX yCr^V^^r IM ^Y … HR if? Fig. 55 Shadovv of db on planes R-S-T-VShades and shadows · Geometry, Descriptive
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
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