American Long-eared Owl (Asio otus here as Asio wilsonianus); Short-eared Owl (Asio flammeus here as Asio accipitrinus) from Pennsylvania bird life; a manual of the birds of Pennsylvania; treating especially of their food, from examinations of several thousand stomachs, made during all seasons of the year, with descriptions of the birds, their nests, eggs and habits by Warren, Benjamin Harry, 1858-1926 Publication date 1892
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