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Close-up van een met waterstof gevulde ballon op Cambridge Bay Upper Air station, Nunavut, Canada
Hydrogen filled balloon ready for launch. The radiosonde can be seen on the wooden stand. Photo taken at Cambridge Bay Upper Air, Nunavut, Canada on 13th June 1999 at 23:10 UTC (17:10 MDT). Source: english wikipedia, original upload 27 July 2005 by [[:e