Inscription
lower center in pen and brown ink: Blue Yellow Back Warbler A.W. / Sylvia Pusilla / drawn by J.J. Audubon; lower left in pen and brown ink: No. 33; lower left in graphite: May 7th 1812. Pens.a-; other hand, lL //in graphite: Geranium maculatum
Marks and Labels
upper left: three letters partly visible
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