TY  - RPRT
TI  - Distribution, abundance, and breeding activities of Southwestern Willow Flycatchers ( Empidonax traillii extimus ) on the San Dieguito River and upper San Luis Rey River, San Diego County, California—2025 data summary
AU  - Scarlett L. Howell
AU  - Barbara E. Kus
PY  - 2026
DO  - 10.3133/dr1225
UR  - https://pubs.usgs.gov/publication/dr1225
ID  - dr1225
ER  -