1. Accident facts. National Safety Council Report, 1955.
2. A.M.A. Special Committee Report Estimation of loss of visual efficiency Arch. Ophth. 54: 462 (Sept.) 1955
3. American Automobile instruction sheet.
4. American Optical Co. instruction sheet, Pamphlet No. 1235-P.A.
5. Bausch & Lomb instruction sheet for attachment.