| Color standards and color nomenclature R Ridgway The author, 1912 | 2950 | 1912 |
| The Birds of North and Middle America: A descriptive catalogue of the higher groups, genera, species, and subspecies of birds known to occur in North America, from the Arctic … R Ridgway US Government Printing Office, 1914 | 1426* | 1914 |
| A history of North American birds SF Baird, TM Brewer, R Ridgway Little, Brown, 1874 | 170 | 1874 |
| Color standards and color nomenclature Washington R Ridgway DC: Published by the author, 1-43, 1912 | 133 | 1912 |
| A nomenclature of colors for naturalists: and compendium of useful knowledge for ornithologists R Ridgway Little, Brown, 1886 | 93 | 1886 |
| The water birds of North America SF Baird Little, Brown,, 1884 | 78 | 1884 |
| A manual of North American birds R Ridgway JB Lippincott Company, 1900 | 76 | 1900 |
| Color standards and color nomenclature. 43 pp. illus R Ridgway Washington, DC, 1912 | 73 | 1912 |
| Birds of the Galápagos archipelago R Ridgway Рипол Классик, 1897 | 54 | 1897 |
| The ornithology of Illinois R Ridgway HW Rokker, printer, 1889 | 51 | 1889 |
| On birds collected by Doctor WL Abbott in the Seychelles, Amirantes, Gloriosa, Assumption, Aldabra, and adjacent islands, with notes on habits, etc., by the collector R Ridgway Proceedings of the United States National Museum, 1896 | 45 | 1896 |
| Water absorption by reptile eggs during incubation B Cunningham, AP Hurwitz The American Naturalist 70 (731), 590-595, 1936 | 43 | 1936 |
| Nomenclature of colors R Ridgway Univ. Press, John Wilson & Son, Cambridge. p129, 1886 | 43 | 1886 |
| The humming birds R Ridgway US Government Printing Office, 1892 | 37 | 1892 |
| Ornithology R Ridgway (No Title), 1877 | 33 | 1877 |
| Notes on the vegetation of the lower Wabash Valley R Ridgway The American Naturalist 6 (12), 724-732, 1872 | 24 | 1872 |
| New genera, species and subspecies of Formicariidae, Furnariidae, and Dendrocolaptidae R Ridgway Proceedings of the Biological Society of Washington, 1909 | 18 | 1909 |
| Studies of the American Falconidae R Ridgway Bull. US Geol. Surv. Territories, II. 89-182. 1876, 1876 | 18 | 1876 |
| Ornithology of Guadeloupe Island, based on notes and collections made by Dr. Edward Palmer R Ridgway Bull. US Geol. Surv. Territories, II. 183-195. pl. 30, 31. 1876, 1876 | 18 | 1876 |
| Descriptions of some new birds collected on the islands of Aldabra and Assumption, northwest of Madagascar, by Dr. WL Abbott R Ridgway Proceedings of the United States National Museum, 1893 | 16 | 1893 |
Spencer Fullerton Baird (1823–1887)National Museum of Natural History & Secretary, Smithsonian InstitutionVerified email at si.edu