Cite this: Baird, Spencer Fullerton. 1860. The birds of North America : the descriptions of species based chiefly on the collections in the Museum of the Smithsonian Institution with the co-operation of John Cassin and George N. Lawrence Atlas (1860), Philadelphia : J.B. Lippincott & Co.
Supplied Caption: 1. White-throated swift 2. Vaux's Swifts