TY  - RPRT
TI  - Geographic variation in the plumage coloration of willow flycatchers Empidonax traillii
AU  - Eben H. Paxton
AU  - Mark K. Sogge
AU  - Thomas J. Koronkiewicz
AU  - Mary Anne McLeod
AU  - Tad C. Theimer
PY  - 2010
UR  - https://pubs.usgs.gov/publication/70004700
ID  - 70004700
ER  -