Created by Viktor Almqvist
Contributed by Miguel Sanz
Contributed by D. Mx
Contributed by Robin Rendle
Contributed by Florian Hardwig
Contributed by Stephen Coles
Contributed by Indra Kupferschmid
Contributed by Nick Sherman
Photo(s) by Frank Grießhammer on Flickr.
Contributed by Herb Lubalin Study Center
Contributed by Matthijs Sluiter