Anyone who owns an iPad, I recommend this iBook all about graffiti: Henry Chalfant’s Graffiti Archive. It catalogs New York City subway graffiti in the 80s … the formation of Hip Hop! Whether you like art history, street lore, sociology or even if you simply love the pictures, this iBook is incredible. Here is the link: - https://itunes.apple.com/us/book/henry-chalfants-big-subway/id531594319?mt=11