Atkinson, Thomas George Technic of Refraction, Trial Case and Refractive Instruments: A Manual of Practical Refraction With Instructions for the Operation of the Trial Case ... Carrying Out a Case of Ocular Refraction
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Technic of Refraction, Trial Case and Refractive Instruments: A Manual of Practical Refraction With Instructions for the Operation of the Trial Case ... Carrying Out a Case of Ocular Refraction