We wish to thank our colleagues at the following institutions for their help in locating copies of the original publications and making them available for digitisation:

• Koninklijke Bibliotheek – National Library of the Netherlands
• Nederlands Instituut voor Wetenschappelijke Informatiediensten - Netherlands Institute for Scientific Information Services
• Bibliotheek der Rijksuniversiteit Groningen – Library of the University of Groningen
• Bibliotheek Universiteit van Amsterdam – Library of the UvA

Brill Academic Publishers graciously allowed us to use the biographies from their publication A History of Science in The Netherlands. Survey, Themes and Reference, K. van Berkel, A. van Helden and L. van Palm eds. (Leiden: Brill, 1999).

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