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This book is primarily a review of the literature on the development and use of Grenz rays. Since the author is a dermatologist, most of the clinical discussion is on this specialty.
The book has limited interest to ophthalmologists since the eye section is incomplete and inconclusive.
Merriam GR. Ultra-soft X-rays.. Arch Ophthalmol. 1969;81(3):452. doi:10.1001/archopht.1969.00990010454032