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 1969 has 0.50 USD cover price. Has thin line at bottom of pages from uneven trimming.
2nd-4th print by The Print Mint.
2nd print June 1973 and 3rd print June 1974 have 0.50 USD cover price. Believed to be indistinguishable from each other.
4th print 1976 has 0.75 USD cover price.
Illustration on inside of front cover.
Unused cover idea? The title page for this issue.
Illustration on inside of back cover.
Image on back cover of issue.