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Journal of Observations Made for Ascertaining the Time of the Place, in the Observatory, which was Erected at Helgoland for that Purpose

Heinrich Christian Schumacher

出版	Commission bei Perthes und Besser, 1825
URL	http://books.google.com.hk/books?id=KNfTY9naWZIC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN