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- History of the First Hundred Years. Amsterdam: Elsevier. p. 148. ISBN 978-0-444-40776-4. "Thomsen's Systematic Arrangement of the Chemical Elements". The...65 KB (6,339 words) - 19:10, 18 September 2024
- periodic system of chemical elements. Elsevier. pp. 315–316. ISBN 978-0-444-40776-4.. Rhodes, R. (2012). The Making of the Atomic Bomb (25th Anniversary ed...137 KB (16,017 words) - 03:15, 10 November 2024
- Elements: A History of the First Hundred Years. Amsterdam: Elsevier. ISBN 978-0-444-40776-4. Verde, M., ed. (1971). Atti del convegno Mendeleeviano: Periodicità...249 KB (26,983 words) - 09:31, 9 November 2024