Reference citation:
D. L. Pattie and N. A. M. Verbeek, Alpine birds of the Beartooth Mountains, Condor 68:167-176 (1966)

Source archive URL:
globalbioticinteractions/spire

Source DOI:
https://github.com/globalbioticinteractions/spire/archive/b2f52536ed93797820e4295fe1097310d37ddbaa.zip