Oustalet's Gray Duck, between 1922 and 1926

Hawaiian duck (male and female), oustalet's gray duck (anas oustaleti), and laysan teal. From a natural history of the ducks. Volume. Ii. The genus anas by john c. Phillips associate curator of birds in the museum of comparative zoology at harvard college with plates in color and in black and white from drawings frank w. Benson, allan brooks, louis agassiz fuertes and henrik grönvold. Date: between 1922 and 1926.