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G.R.A.S.S., great revolutionary American standard system : the official guide for assessing the quality of marijuana on the 1 to 10 scale / written by Jack Herer & Al Emmanuel ; illustrated by Carl Muecke ; editorial assistance, Willoe (Billie) Burton & Paul Scott.

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G.R.A.S.S., great revolutionary American standard system : the official guide for assessing the quality of marijuana on the 1 to 10 scale / written by Jack Herer & Al Emmanuel ; illustrated by Carl Muecke ; editorial assistance, Willoe (Billie) Burton & Paul Scott.