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- Rediscovery of the Elements: The Noble Gases--Rayleigh and Ramsay
- Article describing the discovery of argon, helium, and other inert gases by Lord Rayleigh, Sir William Ramsay, and other collaborators. Ramsay also characterized the noble gases and classified them within the structure of the Periodic Table of Elements.
- Rediscovery of the Elements: The Periodic Table
- Article recounting the history of the development of the Periodic Table. Sites pertinent to this development were visited by the authors, who provide related tourist information.