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The Astronomical Aspects of the Relativity Theory of Gravitation
The Rotation of the Earth

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Foerster Lectures on the Immortality of the Soul
Charles M. and Martha Hitchcock Lectures
Howison Lectures in Philosophy
Jefferson Memorial Lectures
Bernard Moses Memorial Lecture
Carl O. Sauer Memorial Lecture
Barbara Weinstock Lectures on the Morals of Trade

The System of Astronomical Constants

William De Sitter, Professor of Astronomy and Director, Astronomical Observatory, University of Leiden