Internet Database of Periodic Tables
There are thousands 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.
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From Revue Scientifique 1934, V. Romanoff's paper (pages 661–665) Le Système Périodique de Mendéléeff Par Représentation Graphique.
Dr. Erik Strub writes:
"The article's Fig. 1 is the first [formulation] (to my knowledge) which contains a
"classical" representation of the periodic system in which an Actinoide series is
placed beneath the Lanthanoides and not beneath the d block elements:
Romanoff's System of 1934 (from van Spronsen):
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