Wiens, J.D., K.M. Dugger, K.E. Lewicki, and D.C. Simon. 2017. Effects of experimental removal of
Barred Owls on population demography of northern Spotted Owls in Washington and Oregon—2016
progress report: U.S. Geological Survey Open-File Report 2017-1040, 23 pp. https://doi.org/10.3133/ofr20171040
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