TY - RPRT TI - Distribution and abundance of Least Bell’s Vireos ( Vireo bellii pusillus ) and Southwestern Willow Flycatchers (Empidonax traillii extimus) at the Mojave River Dam, San Bernardino County, California—2021 Data summary AU - Scarlett L. Howell AU - Barbara E. Kus PY - 2022 DO - 10.3133/dr1149 UR - https://pubs.usgs.gov/publication/dr1149 ID - dr1149 ER -