Parisios 14.12.2015 | 10:45Josef Maria Eder (Austrian, 1855–1944) andEduard Valenta (Austrian, 1857–1937)Table of the Permeability of Various Substances to Roentgen Rays, 1896http://www.artic.edu/aic/collections/artwork/205246?search_no=1&index=0