This volume contains 19 invited papers from the International Symposium on POPULATION Genetics of Forest Trees which was held in Corvallis, Oregon, USA, July 31-August 2, 1990. The papers summarize and review the contributions of biochemical genetic markers to the understanding of population genetic structure and evolutionary biology of forest trees, and identify promising areas for future research. Applications of biochemical genetic markers in forestry practice - including breeding zone designation - seed orchard management, and monitoring of genetic resources are also addressed. In addition, the potential of DNA as a biochemical marker is discussed. This overview of the field of population genetics of forest trees will be of great interest to researchers in forest biology as well as forestry practitioners.