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Browsing Extension Service and Agricultural Experiment Station by Author "Callihan, R. H. (Robert Harold), 1933-"

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Browsing Extension Service and Agricultural Experiment Station by Author "Callihan, R. H. (Robert Harold), 1933-"

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  • Burrill, L. C.; Callihan, R. H. (Robert Harold), 1933-; Parker, Robert, 1941-; Washington State University. Cooperative Extension; Pacific Northwest Cooperative Extension ([Pullman, WA] : Washington State University Cooperative Extension, 1994-05)
    Poison oak is common in western Oregon and Washington. Its near relative, poison ivy, is found in eastern Oregon and Washington, throughout Idaho, and eastward. Both plants are native to the Pacific Northwest.
  • Oregon State University. Extension Service; Washington State University. Extension; University of Idaho. Extension; Mallory-Smith, C.; Burrill, L. C.; Callihan, R. H. (Robert Harold), 1933-; Parker, R.; Radtke, H.; Pacific Northwest Cooperative Extension; Coombs, Eric M. ([Covallis, Or.] : Oregon State University Extension Service, 1997-07)

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