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.