Geographical distribution of American dusky flycatcher.    Breeding  Migration  Nonbreeding
Pereyra, M. E. and J. A. Sedgwick (2015). Dusky Flycatcher (Empidonax oberholseri), version 2.0. In The Birds of North America (A. F. Poole, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi-org.acces.bibl.ulaval.ca/10.2173/bna.78
Cephas