A centennial volume of the writings of Charles Goodyear and Thomas Hancock comprising "Gum-elastic and its varieties, with a detailed account of its applications and uses and of the discovery of vulcanization" by Charles Goodyear, and the "Personal narrative of the origin and progress of the caoutchouc or india-rubber manufacture in England" by Thomas Hancock. Published as a souvenir of the centennial meeting of the American Chemical Society in commemoration of the discovery of the vulcanization of rubber - Goodyear, Charles 1800-1860; Hancock, Thomas 1783-1849 (American Chemical Society, 1939)