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  1. USDA Forest Service research note SE
  2. USDA Forest Service research paper PNW
  3. USDA Forest Service research paper NE
  4. USDA Forest Service research paper PSW
  5. USDA Forest Service research paper INT
  6. U.S.D.A. Forest Service research note FPL
  7. Forest Service research note NE
  8. Forest Service research note SE
  9. U.S. Forest Service research note CS
  10. U.S.D.A. Forest Service research note ITF