Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish different printings.
1st print September 1970 has 0.50 USD cover price. Has Shattuck Square address on inside front cover and on back cover.
2nd-5th prints have 0.50 USD cover price. Have minor address variations. 4th print has address partially blacked out.
Inside front cover sequence with indicia information at bottom of page.
Inside back cover advertisement parody.