Author: Orson Pratt, Sen
Title: Key to the Universe, or a New Theory of Its Mechanism, Founded Upon a I. Continuous Orbital Propulsion, Arising from the Velocity of Gravity and Its Consequent Aberrations; II. Resisitng Ethereal Medium of Variable Density, with Mathematical Demonstrations and Tables
Description: Layton, UT, Eborn Books, 1990. Hardcover. 118p. A hardcover book in fine condition with a like dustjacket. The text is clean and the binding tight. A reprint of a Mormon astronomer's theory of the universe, first published in 1879. .

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