Roger Gastman is one of the great graffiti historians. All of his books should be on your shelf. Read Freight Train Graffiti (foreword written by Lord SHR). Every page captured trains docked in yards that waited patiently for writers to make them look like Sistine Chapels of Philly and NY. Even Patrick “SIRE” Elasik (RIP) and Adrien “STREN” Moeller, the flesh and blood of Mass Appeal‘s inception are canonized in the Gastman classic. Reading is fundamental, but so is Wall Writers: Graffiti In Its Innocence, giving insight for the reading impaired.