That’s where graffiti photography legend Martha Cooper comes in. Shooting the origins of hip-hop and graffiti cultures since the late 1970s in New York City, and later all over the world, Cooper’s well-trained eyes know how to recognize deft sticker art. Here then is a collection of more than 200 photographs of some of Cooper’s favorite handmade postal stickers from around the world, whether done by some of the scene’s better-known artists or the anonymous. Going Postal documents how an old-school method has burgeoned into another rich facet of the world’s graffiti cultures.