Energy, Economic and Ecological Relationships for Gotland, Sweden (A Regional Systems Study), by A. M. Jansson & J. Zuchetto. (Ecological Bulletins 28.) Swedish Natural Science Research Council, Wenner Gren Center, Box 23136, S 104 35 Stockholm, Sweden: 156 pp., figs & tables, 24.2 × 16.5 × 0.8 cm, paperbound, Sw.Cr. 70, 1978.