For the entire first half of the twentieth century, Edgar Rice Burroughs was the most widely read American author. As per a 1963 statistic of Life Magazine, Burroughs' paperback books were runaway best-sellers; over ten million copies sold within just one year of their release, accounting for a full thirtieth of US annual paperback sales. While Burroughs' beloved tales are certainly popular for their fantastic plots and classic characters, interest in the books has been spurred by controversy.