RPS Collection at the National Media Museum, Bradford, England: http://arttattler.com/archivephotographyoftheinvisible.html
Obit.: Br. Med J. 1895 May 11; 1(1793): 1067–1069; Corey Keller: Brought to Light Photography and the Invisible, 1840-1900, 2009;
pioneer of microphotography,cf. online-obit. at www.ncbi.nlm.nih.gov/pmc/articles/PMC2509729/?page=2 & http://livesonline.rcseng.ac.uk/biogs/E001480b.htm
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