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Brooks comet, C/1911 O1 (Brooks) 74:29 (2008-003)Series VI: Yerkes Observatory
Brooks comet, C/1911 O1 (Brooks) 74:30 (2008-003)Series VI: Yerkes Observatory
Main Observatory 12:1 (2008-003)Series VI: Yerkes Observatory
Formal 11:2249 (2008-003)Series VI: Yerkes Observatory
Group 7:122 (2008-242)Series VI: Yerkes Observatory
Informal 7:121 (2008-242)Series VI: Yerkes Observatory
Drawing, Orbit of Planet X 1Series II: Buildings and Grounds
Trans-Neptunian Planet (Pluto) 1Series II: Buildings and Grounds