GIFFORD, E.W. 1913
The birds of the Galapagos Islands, with observations on the of Cocos and Clipperton Islands.
(Proc. of the California Acad. of Sci., S.4, Vol.
II.pp. 132, 7 pl.
San Francisco, 1913.
GIFFORD, E.W. 1919
Field notes on the Land-birds of the Galapagos Island.
(Proc. Calif. Acad. Sci., (4) 2 pt. pp.. 189-258).
San Francisco, Cal., 1979.
GIFFORD, E.W. 1953.
Re Archaeology of the Galapagos Islands.
(American Antiquity, T. 19, N. 2, p. 171)
Salt Lake City, 1953.
