Meyer's Periodisches System der Elemente
Periodic Table of Meyer (1918) with an intraperiodic accommodation of the rare earths. Reproduced from Meyer, S., 1918. Phys. Z. 19, 178.
Philip Stewart has provided a bit more detail:
Stefan Meyer (1872–1949) was an Austrian physicist, no relation of Julius Lothar Meyer. He had a special interest in 'rare earth' and radioactive elements. He published several versions of the periodic table. In this definitive version of 1918, note elements 69-72. Tu I is 'thulium I', Ad is Aldeberanium (Yb), Cp is Cassiopeium (Lu) and Tu II is 'thulium II' (Hf).:
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© Mark R. Leach 1999-
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