Sal, Vern's article was reprinted in Book 3 of the 4 book set of Journal article reprints, pages 868 -886 and 889. Other articles on the Gutta Percha cases in those 4 volumes are : Book 1, p. 205-206; Book 2 p.338 & p.488 and Book 4, p. 1048,1050-1051, 1093, 1148 & 1186. Ed.