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File:Optical Variables Measurements Yerkes 40 inch Refractor Telescope 1897.jpg

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Optical_Variables_Measurements_Yerkes_40_inch_Refractor_Telescope_1897.jpg(361 × 436 pixels, file size: 70 KB, MIME type: image/jpeg)

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current16:51, 2 March 2012Thumbnail for version as of 16:51, 2 March 2012361×436 (70 KB)Beichner (Talk | contribs)

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