%0 Article %T Biological systems in tree breeding. %A Koski, Veikko %D 1991 %J Silva Fennica %V 25 %N 4 %R doi:10.14214/sf.a15614 %U https://silvafennica.fi/article/5456 %X

This issue of Silva Fennica includes the presentations given in a joint meeting of two IUFRO working parties, S2.04-02, Breeding theory and progeny testing, and S2.02-16, Seed orchards. The sessions were held in Tuusula, Finland on September 10–15, 1991.