RPX01: Rontgen, W.C., The X-RAYS
From Smithsonian Annual Report 1898. Translation of early papers by Rontgen on his research on X-RAYS. from 1895 to 1897. 19 pages. 2 to 1. $2.50.

RPX02: Thomson, J. J., Cathode Rays
Washington 1898 GPO. From Smithsonain Annual Report 1898. Pages 157 to 168. From Address to the Royal Inst. April 30, 1897 (and in Proceedings of Royal Inst.) at which he described the discovery of the electron. 12 pages. 2 to 1. $2.00