[... catalog of the exhibition the Clockwork Universe shown in Munich from April 15 to September 30, 1980, and in Washington, D.C., from November 7, 1980, to February 15, 1981 ... conceived, planned, and produced jointly by the National Museum of History and Technology, Smithsonian Institution, Washington, D.C., and the Bayerisches Nationalmuseum, Munich] ; edited by Klaus Maurice and Otto Mayr

Smithsonian Institution , Neale Watson Academic Publications , Hilger 1980

U.S

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Elvira E. und Vladimir Clain-Stefanelli

Battenberg 1978 Welt der Münzen 5

Ldr.

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Los Angeles County Museum of Art c1976

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by John T. Schlebecker

Smithsonian Institution Press 1972 Smithsonian studies in history and technology no. 17

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