This issue has variants.
Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print was self-published by Jack Jackson in 1964.
2nd print has no (0.50 USD) cover price. Has pink border with red central color.
3rd print has 0.50 USD cover price. Has blue border with green central color.
4th print has 0.50 USD cover price. Has red border with yellow central color.
Inside front cover with indicia information at bottom of page.
Inside back cover list of contributors.
Illustration on back cover.