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Books Books 1 - 1 of 1 on visual purple" theory has been criticised on the ground that the length of time required....  
" visual purple" theory has been criticised on the ground that the length of time required... "
A Study of the Purkinje Phenomenon with Spectral Lights - Page 7
by Mrs. Ethel Mary Chamberlain Porter - 1911 - 52 pages
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Annual Report of the Commissioner of Labor

United States. Bureau of Labor - Labor - 1902
...experience. The courses require the whole time of the students for two years. This feature of the school has been criticised on the ground that the length of time required debars many from availing themselves of its advantages, and it has been suggested that by cutting out...
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