Tijuana bibles (also known as eight-pagers or irty little eight-pagers) were pornographic comic books produced in the United States from the 1920s to the early 1960s. Their popularity peaked during the Great Depression era. The typical "bible" is 4 by 6 inches (approx. 10 x 15 cm), with black printing on cheap white paper, and eight pages long. In most cases the artists, writers and publishers of these tracts are unknown. The quality of the artwork varied widely and sometimes included racial caricatures (Black people are portrayed with huge lips and protruding eyes). Their subject is explicit sexual escapades usually featuring well known cartoon characters, political figures or movie stars (used without permission).