The legendary underground comic book that started it all back in 1967 is back with a 15th issue.  The long time regulars --  R. Crumb, S. Clay Wilson, Spain and Victor Moscoso -- welcome a couple of fellow old-timers to the ranks of Zap for the first (?) time:  Paul Mavrides and Gilbert Shelton, to whose famous early (pre-Freak Brothers) creation, Wonder Warthog, is given one of the two covers in the 69 layout.  As would be expected, the highlight of the issue is the ten-page Crumb story, "Walkin' the Streets," which, if his dated signature is to be believed, he worked on for twelve years!  This is the story that was exhibited in its entirety at the latest Carnegie International.  If you missed it, you can take it from us:  it's a classic.  In addition to the individual works by the contributors listed above, another tradition returns in this issue --  the Zap Jam:  everybody dived in for a group two-page swim in the pen, ink and paper pool of comics.