Seaborg's Periodic Table of 1945
From his Priestly Medal Address, The Periodic Table: Tortuous Path to Man-Made Elements printed in C&EN April 16, 1979 and reprinted in Modern Alchemy: Selected Papers of Glenn T. Seaborg (1994), page 181.
Seaborg describes how "the theory was advanced that [the] new elements heavier than than actinium might constitute a second series similar to the series of 'rare-earth' or 'lanthanide' elements":
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