Nomenclator botanicus. Nominum ad finem anni 1858 publici juris factorum, classes, ordines, tribus, familias, divisiones, genera, subgenera vel sectiones designatium enumeratio alphabetica. Adjectis auctoribus, temporibus, locis systematicis, apud varios, notis literariis atque etymologicis et synonymis - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (Sumptibus T. Fischeri, 1873)

Nomenclature of the apple : a catalogue of the brown varieties referred to in American publications from 1804 to 1904 - Ragan, W. H. 1836 -1909 (U.S. GPO, 1926)

Norfolk natterjack - Norfolk; Norwich Naturalists' Society. (Norfolk and Norwich Naturalists Society, 2011)

North American fauna - U.S. Fish; Wildlife Service (Fish and Wildlife Service; for sale by the Supt. of Docs., U. S. Govt. Print. Off, 1938)

North American fauna - U.S. Fish; Wildlife Service (Fish and Wildlife Service; for sale by the Supt. of Docs., U. S. Govt. Print. Off, 1941)

North American flora - New York Botanical Garden (New York Botanical Garden, 1937)

North American flora - New York Botanical Garden (New York Botanical Garden, 1910)

North American flora - New York Botanical Garden (New York Botanical Garden, 1922)

North American flora - New York Botanical Garden (New York Botanical Garden, 1906)

North American flora - New York Botanical Garden (New York Botanical Garden, 1912)

North American flora - New York Botanical Garden (New York Botanical Garden, 1920)

North American flora - New York Botanical Garden (New York Botanical Garden, 1921)

North American flora - New York Botanical Garden (New York Botanical Garden, 1926)

North American flora - New York Botanical Garden (New York Botanical Garden, 1927)

North American flora - New York Botanical Garden (New York Botanical Garden, 1939)

North American flora - New York Botanical Garden (New York Botanical Garden, 1940)

North American flora - New York Botanical Garden (New York Botanical Garden, 1914)

North American flora - New York Botanical Garden (New York Botanical Garden, 1917)

North American flora - New York Botanical Garden (New York Botanical Garden, 1924)

North American flora - New York Botanical Garden (New York Botanical Garden, 1932)

North American flora - New York Botanical Garden (New York Botanical Garden, 1923)

North American flora - New York Botanical Garden (New York Botanical Garden, 1913)

North American flora - New York Botanical Garden (New York Botanical Garden, 1909)