Soil organisms as components of ecosystems : Lohm, U. and Persson, T. (Editors), Proc. VI. International Soil Zoology Colloquium, Uppsala, June 1976. Ecological Bulletins Vol. 25, 614 pp. 1977. Price: 140 SwCr (ca. [pound sign]20[middle dot]00 incl. air mail postage)