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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/13030/k6qr53xr/?order=1
Title:
Empidonax difficilis. Western Flycatcher.
Description:
"Yellow-Bellied Flycatcher . . . Cal. Maple . . . Hot Springs, Napa -July 1859" --Two birds perched on a fruiting branch.
Contributing Institution:
UC Berkeley, Bancroft Library