Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print August 1970 has 0.50 USD cover price. Has no copyright information on bottom of inside front cover.
2nd print has 0.50 USD cover price. Copyright information added. Glossy cover.
3rd print has 0.50 USD cover price. Has matte finish cover.
Inside front cover sequence.
Inside back cover sequence.