Many of the books in this collection contain extremely mature themes, language and imagery — We strongly suggest a reading age of 18+
Underground comix are books from the 60's & 70's seen as socially relevant or satirical in nature. They often depict content forbidden to mainstream publications by the Comics Code Authority, including explicit drug use, sexuality, violence and oftentimes socially problematic behavior.
In other words, Underground Comix contain a lot of racist and sexist nonsense that everyone thought was really funny, progressive and thought provoking in the 60's and 70's. No one said they were smart.