Nova acta physico-medica Academiae Caesareae Leopoldino-Carolinae Naturae Curiosum - Academia Caesarea Leopoldino-Carolina Naturae Curiosorum. (1836)

Novorum actorum Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum - Kaiserlich Leopoldinisch-Carolinische Deutsche Akademie der Naturforscher (Friedrich Frommann, 1860)

Novorum actorum Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum - Kaiserlich Leopoldinisch-Carolinische Deutsche Akademie der Naturforscher (Friedrich Frommann, 1865)

Novorum actorum Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum - Academia Caesarea Leopoldino-Carolina Naturae Curiosorum. (Friedrich Frommann, 1852)

Novorum actorum Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum - Academia Caesarea Leopoldino-Carolina Naturae Curiosorum. (Friedrich Frommann, 1954)

Die Oberschlesische Steinkohlenflora I. Teil Farne und farnähnliche Gewächse (Cycadofilices besw. Pteridospermen) - Gothan, Walther (Walther Ulrich Eduard Friedrich), 1879 -1954 (Königlich Preussischen Geologischen Landesanstalt, 1913)

Obras completas y correspondencia científica - Ameghino, Florentino, 1853 -1911 (Taller de Impresiones Oficiales, 1914)

Observations on the structure of fossil plants found in the carboniferous strata - Binney, Edward William, 1812 -1881 (Printed for the Palæontographical society, 1868)

Occasional papers - Boston Society of Natural History. (1893)

Occasional papers of the Farlow Herbarium of Cryptogamic Botany - Farlow Reference Library; Herbarium. (Harvard University, Farlow Herbarium of Cryptogamic Botany, 1974)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1890)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1900)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1906)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1912)

Oesterreichisches botanisches Wochenblatt ([L.W. Seidel], 1856)

Official guide to the museums of economic botany No. 2 Monocotyledons and cryptogams (Printed for H.M. Stationary Off. by Eyre and Spottiswoode, 1895)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1867)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1869)

Ohio fossils - La Rocque, Aurèle, 1909 - (Ohio Dept. of Natural Resources, Division of Geological Survey, 1955)

The Ohio journal of science - Ohio Academy of Science. (Ohio Academy of Science, 1909)

The Ohio journal of science - Ohio Academy of Science. (Ohio Academy of Science, 1912)

The Ohio journal of science - Ohio Academy of Science. (Ohio Academy of Science, 1918)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1900)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1905)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1903)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1911)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1913)

Old bones : or, Notes for young naturalists - Brooks, Vincent, 1815? -1885 (Robert Hardwicke, 1861)

Old bones : or, Notes for young naturalists, on vertbebrate animals, their fossil predecessors and allies - Symonds, W. S. 1818 -1887 (Robert Hardwicke, 1864)

The old red sandstone; or, New walks in an old field : To which is appended a series of geological papers, read before the Royal Physical Society of Edinburgh - Miller, Hugh, 1802 -1856 (Gould and Lincoln, 1858)

On fucoides in the coal formations - Lesquereux, Léo, 1806 -1889 (1866)

On growth and form - Thompson, D'Arcy Wentworth, 1860 -1948 (University press, 1917)

On Lepidoptera Heterocera from China, Japan, and Corea - Leech, John Henry, 1862 -1900 (1897)

On molecular and microscopic science - Somerville, Mary Fairfax, 1780 -1872 (J. Murray, 1869)

On molecular and microscopic science - Somerville, Mary, 1780 -1872 (J. Murray, 1869)

On Neuropteris plicata Sternberg and Neuropteris rectineruis Kidston n. sp. On the fossil flora of the Staffordshire coal fields - Kidston, Robert, 1852 -1924 (Grant, 1888)

On new plants from the Erian and carboniferous, and on the characters and affinities of palaeozoic gymnosperms - Dawson, J. W., (John William), 1820 -1899 (Dawson Brothers, 1890)

On new plants from the Erian and Carboniferous and on the characters and affinities of paleozoic gymnosperms - Dawson, J. W., (John William), 1820 -1899 (s.n, 1890)

On new tree ferns and other fossils from the Devonian - Dawson, J. W., (John William), 1820 -1899 (s.n, 1871)

On the crustacea and echinodermata of the Pacific shores of North America - Stimpson, William, 1832 -1872 (Boston Society of Natural History, 1857)