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The following individuals have given me updates or suggestions for this list over the years: Devon Ackerman, Nazim Aliyev, Vladimir Benko, Arvin Bhatnagar, Sam Brothers, Per Christensson, JMJ.Conseil, Cornelis de Groot, Jeffrey Duggan, Jean-Pierre Fiset, Peter Almer Frederiksen, Tim Gardner, Chris Griffith, Andis Grosšteins, Paulo Guzmán, George Harpur, Brian High, Eric Huber, Broadus Jones, Axel Kesseler, Nick Khor, Bill Kuhns, Anand Mani, Kevin Mansell, Davyd McColl, Michal, Bruce Modick, Lee Nelson, Dan P., Jorge Paulhiac, Carlo Politi, Stanley Rainey, Cory Redfern, Bruce Robertson, Thomas Rösner, Erik Siers, Mike Sutton, Matthias Sweertvaegher, Erik van de Burgwal, Jason Wallace, Daniel Walton, Franklin Webber, Mike Wilkinson, Gavin Williams, and David Wright. I thank them and apologize if I have missed anyone.
