This issue has variants.
Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish different printings.
1st print April 1973 has 0.50 USD cover price. 1st printing 20,000 copies.
2nd print has 0.75 USD cover price. 3rd print has 1.00 USD cover price.
Inside front cover introductory sequence with indicia information at bottom of page.
Inside of back cover.