Underground Comix are known for using different prices, covers (art or color variations) and interior content to distinguish different printings.
1st print 1975 (actually February 1976) has 0.75 USD cover price.
2nd print has 1.00 USD cover price. 3rd print has 1.50 USD cover price.
Inside front cover with indicia information at bottom of page.
Sequence on inside back cover.