Dr. Erhard Hänssgen’s 42 inch (107 cm) Dobsonian Telescope
Dr. Erhard Hänssgen's 42 inch (107 cm) Dobsonian Telescope Dr. Erhard Hänssgen's 42 inch (107 cm) Dobsonian Telescope Portrait of Dr. Erhard Hänssgen's 42 inch (107 cm) Dobsonian Telescope Source:…
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August 1, 2016