Biological Clocks and Environmental Time. Serge Daan and Eberhard Gwinner, Eds. Guilford, New York, 1989. viii, 197 pp., illus. $35. Also published as a special issue of the Journal of Biological Rhythms (vol. 4, no. 5). Based on a symposium, Munich, F.R.G., Jan. 1988.
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