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Retinoscopy (or Shadow Test) in the Determination of Refraction at One Meter of Distance, with the Plane Mirror

James Thorington

出版	P. Blakiston, son & Company, 1898
URL	http://books.google.com.hk/books?id=GjAbAAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN