Just when you thought I couldn't veer any further off the beaten path, I've gone and posted a cover gallery of an obscure Spanish language magazine. The best I can gather on El Papus is that it was a weekly satirical humor magazine not unlike National Lampoon. Evidently, its satire cut a bit too close to the bone and they received a letter bomb in 1977 which killed one of their employees.
The covers aren't anything particularly legendary - mainly just pretty Spanish ladies (having little to nothing to do with the content between the covers). Nonetheless, I ran across a dozen or so issues from 1974, and thought they were interesting and odd enough to preserve on Retrospace.