Telescope in the Yerkes Observatory

上図:The Dream City in Books of the fairs [microform] Research Publications (1989-1990) reel. 105, no. 6.
中図:A portfolio of photographic views of the World in Books of the fairs [microform] Research Publications (1989-1990) reel. 117, no. 4.
下図:Bancroft, H. H.: The book of the fair n.7 (1893)

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