study of the incubation periods of birds
Subtitle: what determines their lengths?
By: by W.H. Bergtold.
Publisher: Kendrick-Bellamy Co.
Published: 1917
Place of publication: Denver
Language: eng
Number of pages: 109
Subjects: Birds -- Eggs; Birds -- Eggs -- Incubation
Notes: "Errata" slip tipped in at p. 109.

Bibliography: p. 105-109.

Fleming Collection.