The Enciclopedia universal ilustrada europeo-americana is a Spanish encyclopedia. It comprises 72 volumes published from 1908 to 1930 plus a ten-volume appendix published 1930–33. Between 1935 and 2003, 33 supplemental volumes were published plus an index, another A–Z appendix, and an atlas, for a total of 118 volumes. Each of the volumes vary in length. As of 1986, it is the longest printed encyclopedia with 105,000 pages and 165,200,000 words.