TY  - RPRT
TI  - Distribution and abundance of Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Upper San Luis Rey River, San Diego County, California—2021 data summary
AU  - Scarlett L. Howell
AU  - Barbara E. Kus
PY  - 2022
DO  - 10.3133/dr1158
UR  - https://pubs.usgs.gov/publication/dr1158
ID  - dr1158
ER  -