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A study of direct and indirect illumination (1912)
Simons, Alexander McDougall · leaf 72
Fig. 11a, Direct lighting distribution for Room No.4 … X A Lamp clusters (2-60 watt lamps each) Scale lr:5*Lighting · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
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