J. Elfreth Watkins (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "J. Elfreth Watkins" in English language version.

refsWebsite

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2books.google.com

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bbc.co.uk

Tom Geoghegan, BBC News: Ten 100-year predictions that came true, 11 January 2012

books.google.com

Who's who in America, Volume 5
Futuring: The Exploration of the Future by Edward Cornish (2004)