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Photometric tests of globes and shades . /80 Cun/ P/ain Opal ShadeAbsorption: MH CP = V 3 5~ YO. Flute Opal 5hade Absorpli on: MHCP= 3 6
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Photo credit: © The Reading Room / Alamy / Afripics
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectph, booksubjecttheses