Elementaire Deeltjes is a 18-book series with 18 released primary works first released in 1998 with contributions by Ineke Sluiter, Rana Mitter, Michael Eliot Howard, Manfred B. Steger, Eric H. Cline, Joseph Dan, John Bowker, Hugo Koning, Peter Atkins, Paul van Tongeren, Bill McGuire, Christopher Goto-Jones, Kees Boterbloem, Katherine Blundell, Cas Mudde, Cristóbal Rovira Kaltwasser, Daniel Pick, Han Entzinger, Dirk De Schutter, Ruud Welten, Bert Jan Lietaert Peerbolte, Klaas Spronk, Daan Bronkhorst, Daniel Knegt, Simon Blackburn, Thijs Lijster, and Derk Walters.