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The British Society for the History of Science, Cambridge, UK
DermIS.net, in German, last update 2005
U.S. National Library of Medicine, Bethesda, USA
National Library of Medicine, Bethesda, USA
Harvard Medical School, Boston, USA
Narodni lekarska knihovna, Prague, Czech Republic, in Czech
The Johns Hopkins University, Baltimore, USA
University of Iowa, Iowa City, USA