David Dunlap Observatory

The David Dunlap Observatory is an astronomical observatory site in Richmond Hill, Ontario, Canada.

John H. Martin. This image cropped from original image and saved in jpeg format with compression level 5 (Paintshop Pro) July 14, 2006 by John H Martin. / CC BY 2.5

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Howard Grubb, Parsons and Co.

John H. Martin. This image cropped from original image and saved in jpeg format with compression level 5 (Paintshop Pro) July 14, 2006 by John H Martin.