The 100th anniversary of the publication of the mass action law by the professors C.M.Guldberg and P. Waage 1964
Ora in esposizione: Norvegia - Francobolli postali - 1964 - The 100th anniversary of the publication of the mass action law by the professors C.M.Guldberg and P. Waage - 2 francobolli.
1964
The 100th anniversary of the publication of the mass action law by the professors C.M.Guldberg and P. Waage
11. Marzo WM: Nessuno Dentellatura: 13
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