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History

• 61
• Twenty First Century Books
• A mail order bookstore specializing in titles related to the inventor Nikola Tesla.

• 62
• Disintegration of Heavy Nuclei
• Bohr on the liquid drop model of fission. Published in Nature. (February 25, 1939)

• 63
• Atomic Structure
• Bohr on electronic structure of the periodic table. Article from Nature. (March 24, 1921)

• 64
• On the Constitution of Atoms and Molecules
• Paper published in the Philosophical Magazine in 1913. (July 26, 1913)