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Erhardt-Siebold, Erika von, 1890-
The astronomy of Johannes Scotus Erigena / by Erika von Erhardt-Siebold and Rudolf von Erhardt.
Erigena, Johannes Scotus, ca. 810-ca. 877.
Astronomy -- History.
Planets, Theory of.
Lowe, E. A. (Elias Avery), 1879-1969.
Erhardt, Rudolf von.
Catalog