TY  - RPRT
TI  - Distribution and abundance of Southwestern Willow Flycatchers (Empidonax traillii extimus) on the upper San Luis Rey River, San Diego County, California—2020 data summary
AU  - Scarlett L. Howell
AU  - Barbara E. Kus
PY  - 2021
DO  - 10.3133/ds1140
UR  - https://pubs.usgs.gov/publication/ds1140
ID  - ds1140
ER  -