Besides the Freak Brothers, no other comix series is more definitive of Underground Comix than Zap. Founded in 1967 by R. Crumb, who sold the first couple of issues out of a baby carriage on Haight Street, the series went on to include Victor Moscoso, Stanley Mouse, Rick Griffin, Gilbert Shelton, S. Clay Wilson and occasional other contributors. A few issues are still in print, and others may be found in the Collectors’ Items category.