File:100 inch Hooker Reflector, Carnegie Astronomical Observatory of Washington D.C. on the Summit of... (NBY 583).jpg
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100_inch_Hooker_Reflector,_Carnegie_Astronomical_Observatory_of_Washington_D.C._on_the_Summit_of..._(NBY_583).jpg (398 × 252 pixels, file size: 25 KB, MIME type: image/jpeg)