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St. Dunstan's International Conference on "sensory Devices for the Blind"
P. G. Gray
其他書名
A Survey of the Mobility and Reading Habits of the Registered Blind in England and Wales
出版Government Social Survey Central Office of Information, 1966
URLhttp://books.google.com.hk/books?id=bdEmMwEACAAJ&hl=&source=gbs_api