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- SpringerLink (Online service)717
- United States. Forest Service656
- Southern Forest Experiment Station (New Orleans, La.)211
- Northeastern Forest Experiment Station (Radnor, Pa.)195
- Pacific Northwest Research Station (Portland, Or.)194
- North Central Forest Experiment Station (Saint Paul, Minn.)179
- Food and Agriculture Organization of the United Nations157
- Southeastern Forest Experiment Station (Asheville, N.C.)155
- Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)130
- United States. Forest Service. Southern Research Station127
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)124
- United States118
- United States. Forest Service. Northern Research Station, issuing body91
- Library of Congress. Congressional Research Service90
- Intermountain Research Station (Ogden, Utah)73
- ebrary, Inc68
- Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)59
- Great Britain. Forestry Commission53
- Rocky Mountain Research Station (Fort Collins, Colo.)51
- Society of American Foresters49