Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print April (actually December) 1976 has 1.00 cover price.
2nd print (1977) has 1.00 USD cover price. Indistinguishable from 1st print?
3rd print (1978) and 4th print (1980) have 1.25 cover price. Indistinguishable from each other.
Inside front cover with indicia information at bottom of page.
Illustrations on inside back cover.