Originally published in 1989, only two chapters have so far been revised. To keep this important document in-print, this complete set has been issued, comprising looseleaf editions of: Original Complete Edition [1989 (1995 reprint): 288 pp.] Non-Vascular Plants [1992: 35 pp.] Bogs [1994: 36 pp.] Intertidal Marine Habitats and Saline Lagoons [1996: 51 pp.] Ringbinder.