Ultra Violet Rays in Modern Dermatology: Including the Evolution of Artificial Light Rays and Therapeutic Technique. E-book. Formato PDF Ralph Bernstein   -  Forgotten Books, 2017  - 

The author has no intention of being over enthusiastic in his deductions as to the value of ultra violet rays in the practice of dermatology, but will give his unbiased and candid Opinions just as he has been able to deduce them from his own personal experience.