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The Detection Of Colorblindness And Imperfect Eyesight By The Methods Of Dr. Snellen, Dr. Daae, And Prof. Holmgren (1881)
The Detection Of Colorblindness And Imperfect Eyesight By The Methods Of Dr Snellen Dr Daae And Prof Holmgren - 1881 Author:Charles Roberts With A Table Of Colored Berlin Wools And Sheet Of Test Types.