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MSU Vincent Voice Library
http://vvl.lib.msu.edu/showfindingaid.cfm?findaidid=EckenerH
Collected speeches of Hugo Eckener. Provides downloadable audio files of recordings.
US Centennial Of Flight - Hugo Eckener
http://www.centennialofflight.gov/essay/Dictionary/eckener/DI21.htm
Features short essay with photo.
Wikipedia: Hugo Eckener
http://en.wikipedia.org/wiki/Hugo_Eckener
Features article about the doctor with links to related information.