Born in San Juan, Lorenzo Homar is arguably Puerto Rico's greatest graphic artist. He passed away in 2004, and his career included his work with the Puerto Rican Arts Center (which he helped found), the House of Cartier, and a broad range of posters and drawings. This excellent digital collection from the Princeton University Library includes many of these works, including a sketchbook from his days in the U.S. Army, a host of caricatures, and over 90 posters.