This issue is a variant of Rowlf (Rip Off Press, 1971 series) [1st print - Wizard].
Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print has a Wizard on the front cover with a Dog Soldier on back cover.
2nd print has the Dog Soldier on the front cover and the Wizard on the back cover.
On inside front cover.
On inside back cover.