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--2020 Data Summary.
- Published in:
- Data Series - U. S. Geological Survey, 2021, n. 1134, p. 1
- By:
- Publication type:
- Article