Vintage U.S. Department of Commerce  Scientific Papers of the Bureau of Standards booklet No.93 titled Glasses For Protecting The Eyes From Injurious Radiations circa 1919. Published at the Government Printing Office in Washington D.C.  Measures 7 X 10 inches in size (8 X 26cm) and is 25 pages in length. Publication is an authentic original in good condition as shown in photos.