Books in Browsing: Nature/Gardening/Animals (sorted alphabetically by author)
- Notes on Stable Management in India and the Colonies Joshua A. Nunn
- Bulletin of the Nuttall Ornithological Club : A quarterly journal of ornithology, Volume VII (1882) Nuttall Ornithological Club
- Humanity to Honey-Bees Thomas Nutt
- Wild Ducks: How to Rear and Shoot Them W. Coape Oates
- Orchids James O'Brien
- The Ohio naturalist, Vol. I, No. 6, April, 1901 Ohio State University. Biological Club
- The O. S. U. Naturalist, Vol. 1, No. 1, November, 1900 Ohio State University. Biological Club
- The Ohio naturalist, Vol. 1, No. 4, February 1901 Ohio State University. Biological Club
- The Ohio Naturalist, Vol. II, No. 1, November, 1901 Ohio State University. Biological Club
- The Ohio Naturalist, Vol. I, No. 7, May, 1901 Ohio State University. Biological Club
- The Ohio naturalist, Vol. 1, No. 8, June 1901 Ohio State University. Biological Club
- The Ohio Naturalist, Vol. 1, No. 5, March, 1901 Ohio State University. Biological Club
- Elements of Physiophilosophy Lorenz Oken
- Etwas von den Wurzelkindern (German) Sibylle Olfers
- Mammals of the Southwest Mountains and Mesas George Olin
- Report on the New York Botanical Garden Olmsted Brothers
- The Andes and the Amazon; Or, Across the Continent of South America James Orton
- A Dissertation on Horses William Osmer
- Michigan Trees: A Handbook of the Native and Most Important Introduced Species Charles Herbert Otis
- Jedermanns Hundebuch : Pflege, Erziehung und Dressur des Haushundes (German) Ernst von Otto-Kreckwitz
- Birds useful and birds harmful J. A. Owen and Ottó Herman
- Cave Regions of the Ozarks and Black Hills Luella Agnes Owen
- Our Common Insects A. S. Packard
- New Subspecies of the Rodent Baiomys from Central America Robert L. Packard
- Speciation and Evolution of the Pygmy Mice, Genus Baiomys Robert L. Packard