Available as free downloads from SORA (pdf file size is given for each volume)
- Grinnell, J. 1900. Birds of the Kotzebue Sound Region, Alaska. 5.6 MB pdf.
- McGregor, R.C. 1901. A List of the Land Birds of Santa Cruz County, California. (1.5 mb pdf)
- Grinnell, J. 1902. Check-List of California Birds. (4.1 mb pdf)
- Swarth, H.S. 1904. Birds of the Huachuca Mountains Arizona. (5.2 mb pdf)
- Grinnell, J. 1909. A Bibliography of California Ornithology. (7.9 mb pdf)
- Information missing - coming soon.
- Willet, G. 1912. Birds of the Pacific Slope of Southern California. (7.4 mb pdf)
- Grinnell, J. 1912. A Systematic List of the Birds of California. (1.2 mb pdf)
- Tyler, J.G. 1913. Some Birds of the Fresno District, California. (7.42 mb pdf)
- Swarth, H.S. 1914. A Distributional List of the Birds of Arizona. (7.2 mb pdf)
- Grinnell, J. 1915. A Distributional List of the Birds of California. (13.3 mb pdf)
- Howell, A.B. 1917. Birds of the Islands off the Coast of SouthernCalifornia. (7.5 mb pdf)
- Pemberton, J.R. 1919. Second Ten Year Index to the Condor Volumes XI-XX 1909-918. (7.6 mb pdf)
- Saunders, A.A. 1921. A Distributional List of the Birds of Montana with Notes on the Migration and Nesting of the Better Known Species. (12.8 mb pdf)
- Bailey, F.M. 1923. Birds Recorded from the Santa Rita Mountains in Southern Arizona. (3.5 mb pdf)
- Grinnell, J. 1924. Bibliography of California Ornithology Second Installment to End of 1923. (9.2 mb pdf)
- Brooks, A., and H.S. Swarth. 1925. A Distributional List of the Birds of British Columbia. (9.1 mb pdf)
- Grinnell, J., and M.W. Wythe. 1927. Directory to the Bird-Life of the San Francisco Bay Region. (10.2 mb pdf)
- Jewett, S.G., and I.N. Gabrielson. 1929. Birds of the Portland Area, Oregon. (3.8 mb pdf)
- Willett, G. 1931. Third Ten Year Index to the Condor Volumes XXI-XXX 1919-1928. (10.8 mb pdf)
- Willett, G. 1933. A Revised List of the Birds of Southwestern California.(11.8 mb pdf)
- Swarth, H.S. 1934. Birds of Nunivak Island Alaska. (3.6 mb pdf)
- Lindale, J.M. 1936. The Birds of Nevada. (10.0 mb pdf)
- Van Rossem, A.J. 1936. Birds of the Charleston Mountains, Nevada. (4.7 mb pdf)
- Linsdale, J.M. 1937. The Natural History of Magpies. (15.6 mb pdf)
- Grinnell, J. 1939. Bibliography of California Ornithology Third Installment to end of 1938.(11.0mb pdf)
- Grinnell, J., and A.H. Miller. 1944. The Distribution of the Birds of California. (40.6 mb pdf)
- Robertson, J.McB. 1947. Fourth Ten Year Index to the Condor Volumes XXX-XL 1929-1938. (11.2mb pdf)
- Friedmann, H., L. Griscom, and R.T. Moore. 1950. Distributional Check-List of the Birds of Mexico Part I. (9.8 mb pdf)
- Skutch, A.F. 1954. Life Histories of Central American Birds. (32.8 mb pdf)
- Marshall, Jr., J.T. 1957. Birds of Pine-Oak Woodland in Southern Arizona and Adjacent Mexico. (9.2 mb pdf)
- 1957. Distributional Check-List of the Birds of Mexico Part II. (22.2 mb pdf)
- Skutch, A.F. 1960. Life Histories of Central American Birds II. (43.3 mb pdf)
- Skutch, A.F. 1969. Life Histories of Central American Birds III. (40.7 mb pdf)
- Missing information - coming soon...
- Maher, W.J. 1974. Ecology of Pomarine, Parasitic, and Long-Tailed Jaegers in Northern Alaska. (8.3 mb pdf)
