DSB; DNB; George Frederick Barker: Memoir of J.W.D., Washington, 1886; K.Hentschel: Why not one more Imponderable? J.W.D.& his 'Tithonic rays', Foundations of Chemistry 4,1 (2002): 5-59. Mapping the Spectrum, 2002; A. Gernsheim 1961: 87
American (English-born) scientist, philosopher, physician, chemist, historian & photographer, since 1832 in Virginia, USA & since 1837 in New York City
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