Figure 1. Polioptila blumbea, Baird. Figure 2. Psaltriparus plumbeus, Baird.
Figure 3. Sitta aculeata, Cassin. Western Nuthatch.
Figure 4. Sitta carolinensis. In: Reports of Explorations and Surveys
.... Volume X. 1859. Plate XXXIII. P. 35 of U. S. Pacific Railroad
Explorations and Surveys near the 35th Parallel. Call Number F593 .U58 1855 .
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