The INTERNET Database of Periodic Tables
There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.
Soddy's Three-Dimensional System
Soddy's three-dimensional system of 1911 (from van Spronsen):
© Mark R. Leach 1999-
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counter started in 2011