Brewster's warbler (Helminthophila leucobronchialis) A hybrid between the golden-winged warbler (Helminthophila chrysoptera) and the blue-winged warbler (Helminthophila pinus)
Cambridge, U.S.A, Printed for the Museum, 1913
1913
Smithsonian
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Public domain. The BHL considers that this work is no longer under copyright protection.