TY  - RPRT
TI  - 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—2019 data summary
AU  - Lisa D. Allen
AU  - Barbara E. Kus
PY  - 2020
DO  - 10.3133/ds1122
UR  - https://pubs.usgs.gov/publication/ds1122
ID  - ds1122
ER  -