1882. Description of a new owl from Porto Rico. Proc. U. S. Nat.
Mus., 4:366-371.
1912. Color standards and color nomenclature. Published by the
author, Washington, D. C.: iii + 43 pp., 53 pls.
1919. The Birds of North and Middle America. Bull. U. S. Nat.
Mus., 50, pt. VIII: xvi + 852 pp., 34 pls.