1. The Life History of Douglas-Fir;Allen,1972
2. Seed potential and seed efficiency;Bramlett,1974
3. Efficacy of supplemental mass-pollination in Douglas-fir seed orchard;Daniels;Silvae Genet.,1978
4. Pollination in Tsuga pattoniana and in species of Abies and Picea;Doyle,1943
5. Flowering in a clone trial of Picea abies Karst;Eriksson;Stud. For. Suec.,1973