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A Field Guide to the Birds
The Behaviour of the Great Tit (Parus major) and Some Other Related Species
Ecology of the Peregrine and Gyrfalcon Populations in Alaska
Studies in the life history of the song sparrow
Studies in the Life History of the Song Sparrow II. The Behavior of the Song Sparrow and Other Passerines.
Life Histories of Central American Birds. Part II. Families Vireonidae, Turdidae, Sylviidae, Troglodytidae, Paridae, Corvidae, Hirundinidae, and Tyrannidae