Tokyo Denki University Press Science and Engineering * "Dictionary of Effects" edited by Toshiharu Takao and Kanichi Fujii 6th edition of the 1st edition, May 30, 1980 * "Dictionary of Theorems and Laws" edited by Kanichi Fujii and Manabu Takeuchi 3rd edition of the 1st edition, August 20, 1980 Both books have scuff marks and discoloration on the covers.