Prentice, Charles Frederick A Treatise On Simple And Compound Ophthalmic Lenses: Their Refraction And Dioptric Formulae, Including Tables Of Crossed Cylinders And Their Sphero-cylindrical Equivalents
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A Treatise On Simple And Compound Ophthalmic Lenses: Their Refraction And Dioptric Formulae, Including Tables Of Crossed Cylinders And Their Sphero-cylindrical Equivalents