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An Essay, entitled the Yard, the Pendulum, and the Metre, considered in reference to the choice of a standard of length. ... Written for the Leeds Astronomical Society, and read before that body ... by P. O'Callaghan, etc

John Frederick William Herschel

出版	1863
URL	http://books.google.com.hk/books?id=n-7p1Rm3fnEC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN