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2018 [1]
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Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Middle San Luis Rey River, San Diego County, southern California—2017 data summary [研究报告]
10.3133/ds1082U.S. Geological Survey. 2018-01-01
Allen, Lisa D.;  Howell, Scarlett L.;  Kus, Barbara E. barbara_kus@usgs.gov
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