1902. H. W. Henshaw. Birds of the Hawaiian Islands, being a complete list of the Birds of the Hawaiian Possessions, with notes on their habits. Honolulu 1902.
1903. Graham Renshaw. The Black Emu.
In: Zoologist 1903, pp. 81-88.
1903. Wilhelm Blasius. Der Riesenalk, Alca impennis L. In the New Edition of Naumann called "Naumann, Naturgeschichte der Vögel Mitteleuropas" (sic), vol. XII, pp. 169-208, pls. 17, 17A-17D, 1903.
(Among others the most complete bibliography and very detailed descriptions.)
1903. Fleming, J. H. On the Passenger Pigeon.
In Auk 1903, p. 66.
1903. M. Guillaume Grandidier. Contribution à l'étude de l'Epiornis de Madagascar.
In: Comptes Rendus des Séances de l'Acad. Sc., Paris 1903 (pp. 1-3 in separate copy.)
1903. G. Grandidier. Note au sujet du squelette de l'Aepyornis ingens.
In Bull. Mus. Paris 1903, pp. 318-323, with figures.