File:Optical Variables Measurements Yerkes 40 inch Refractor Telescope 1897.jpg: Difference between revisions
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[[Image:Optical Variables Measurements Yerkes 40 inch Refractor Telescope 1897.jpg|thumb|right| A 1897 photo of | [[Image:Optical Variables Measurements Yerkes 40 inch Refractor Telescope 1897.jpg|thumb|right| A 1897 photo of the 40 inch refractor telescope at the Yerkes Observatory]] | ||
[[Category:Optical_variables_measurement|{{PAGENAME}}]] | [[Category:Optical_variables_measurement|{{PAGENAME}}]] |
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