197 pages; 8vo (9.25") 23 cm; Softcover, [xx] + 197 + 3 pages, index, bibliography, glossary, 6 appendixes, 22 tables and charts, 80 b/w line illustrations and diagrams. ; 091417178X. 0915904454. Copyright 1981. This is 10th printing. ; Gives info on: Cannabis plant characteristics. How quality is affected by environment. Cloning and other methods of propagation. Identification of male plants. Breeding new strains. THC production. Much more. ; Light edgewear. Front cover shows two light creases. No other defects. Scarce.