GeoEye-1 (OrbView-5)". eoportal.org. Retrieved 5 March 2012. "Dr. Erhard Hänssgen's 42 inch (107 cm) Dobsonian Telescope". www.cruxis.com. "Kleť Observatory...
62 KB (2,233 words) - 20:43, 16 September 2024
Archived from the original on 2010-03-09. Retrieved 2009-08-03. "Dr. Erhard Hänssgen's 42 inch (107 cm) Dobsonian Telescope". Archived from the original on 2010-02-16...
63 KB (2,637 words) - 04:53, 6 July 2024