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, southern California—2016 data summary AU - Lisa D. Allen AU - Scarlett L. Howell AU - Barbara E. Kus PY - 2017 DO - 10.3133/ds1065 UR - https://pubs.usgs.gov/publication/ds1065 ID - ds1065 ER -