This issue is a variant of Zap Comix (Apex Novelties, 1967 series) #1 [1st printing].
This is reprinted twice in the Complete Crumb vol. 4, once in color and once in black & white.
Sequence on inside front cover.
First published appearance of the "Keep On Truckin" image.
Satire on before/after type ads on back cover of issue.