Petrochelidon lunifrons, Cliff-Swallow, Eave-Swallow.
Bird Studies with a Camera (Chapman), pages 89-105; "Where Swallows Roost."
Handbook of Nature-Study (Comstock), pages 112-113.
Bird Migration (Cooke), pages 5, 9, 19-20, 26, 27; Fig. 6.
Our Greatest Travelers (Cooke), page 349; "Migration Route of the Cliff Swallows."
Bird Book (Eckstorm), pages 201-12.
Bird-Lore, vol. 21, page 175; "Helping Barn and Cliff Swallows to Nest."
UNCLE SAM
Haliæetus leucocephalus, the Bald Eagle.
Stories of Bird Life (Pearson), pages 71-80; "A Pair of Eagles."