Subject
- U.S. International Biological Program. Coniferous Forest Biome6
- Douglas fir -- Washington (State) -- Growth4
- Douglas fir -- Diseases and pests -- Washington (State), Western2
- Douglas fir -- Harvesting -- Oregon2
- Douglas fir -- Harvesting -- Washington (State)2
- Douglas fir beetle -- Washington (State), Western2
- Douglas fir tussock moth -- Idaho2
- Douglas fir tussock moth -- Montana2
- Douglas fir tussock moth -- Washington (State)2
- Douglas fir1
- Douglas fir -- Diseases and pests -- Washington (State) -- Cedar Falls1
- Douglas fir -- Diseases and pests -- Washington (State) -- Identification1
- Douglas fir -- Effect of forest management on -- Oregon -- Clackamas County1
- Douglas fir -- Effect of forest management on -- Washington (State) -- Mason County1
- Douglas fir -- Hardiness -- Oregon1
- Douglas fir -- Hardiness -- Washington (State)1
- Douglas fir -- Oregon -- Genetics1
- Douglas fir -- Oregon -- Growth1
- Douglas fir -- Oregon, Western -- Dormancy1
- Douglas fir -- Oregon, Western -- Field experiments1