Methodus foliorum, seu plantae florae Monspeliensis, juxta foliorum ordinem, ad juvandam specierum cognitionem, digestae ... Methode pour connoître les plantes par les feüilles - Boissier de la Croix de Sauvages, François, 1706 -1767 (1751)

Meyers Konversations-Lexikon : eine Encyklopädie des allgemeinen Wissens - Meyer, Hermann Julius, 1826 -1909 (1885)

Meyers Konversations-Lexikon : eine Encyklopädie des allgemeinen Wissens - Meyer, Hermann Julius, 1826 -1909 (Verlag des Bibliographischen Instituts, 1890)

Michelia - Saccardo, P. A. (Pier Andrea), 1845 -1920 (Typis Seminarii, 1877)

Michelia - Saccardo, P. A. (Pier Andrea), 1845 -1920 (Typis Seminarii, 1881)

The micrographic dictionary; a guide to the examination and investigation of the structure and nature of microscopic objects - Berkeley, M. J. (Miles Joseph), 1803 -1889 (J. Van Voorst, 1875)

The micrographic dictionary; a guide to the examination and investigation of the structure and nature of microscopic objects - Berkeley, M. J. (Miles Joseph), 1803 -1889 (J. Van Voorst, 1883)

The micrographic dictionary; a guide to the examination and investigation of the structure and nature of microscopic objects - Griffith, J. W. (John William) (John Van Voorst, 1856)

Midden-Sumatra. Reizen en onderzoekingen der Sumatra-expeditie, uitgerust door het Aardrijkskundig genootschap, 1877-1879, beschreven door de leden der expeditie, onder toezicht van Prof. P.J. Veth - Veth, Pieter Johannes, 1814 -1895 (E.J. Brill, 1881)

Midden-Sumatra. Reizen en onderzoekingen der Sumatra-expeditie, uitgerust door het Aardrijkskundig genootschap, 1877-1879, beschreven door de leden der expeditie, onder toezicht van Prof. P.J. Veth - Veth, Pieter Johannes, 1814 -1895 (E. J. Brill, 1881)

Mikrogeologie : das Erden und Felsen schaffende Wirken des unsichtbar kleinen selbständigen Lebens auf der Erde - Ehrenberg, Christian Gottfried, 1795 -1876 (L. Voss, 1854)

Minutes - Conchological Club of Southern California. (The Club, 1945)

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Mollusca für 1901-1904 : geographische Verbreitung, Systematik und Biologie - Kobelt, Wilhelm, 1840 -1916 (Nicolai?, 1905)

The mollusca of Somerset; land, freshwater, estuarine and marine - Swanton, Ernest W. (Somersetshire Archaeological and Natural History Society, 1912)

I molluschi dei terreni terziarii del Piemonte e della Liguria - Bellardi, Luigi, 1818 -1889 (Stamperia Reale, 1891)

I molluschi dei terreni terziarii del Piemonte e della Liguria - Bellardi, Luigi, 1818 -1889 (Stamperia Reale, 1904)

Molluscorum systema et catalogus. System und aufzählung sämmtlicher conchylien der sammlung vonFr. Paetel. Zur belebung des interesses für malakozoologie nach dessen manuscript hrsg. von dr. L. W. Schaufuss - Schaufuss, L. W. (Ludwig Wilhelm), 1833 -1890 (O. Weiske, 1869)

The mollusks of western North America - Carpenter, Philip P. (Philip Pearsall), 1819 -1877 (Smithsonian Institution, 1872)

Les mollusques marins du Roussillon - Dautzenberg, Ph. (Philippe), 1849 -1935 (J.-B. Baillière, 1882)

Les mollusques marins du Roussillon - Dautzenberg, Ph. (Philippe), 1849 -1935 (J.-B. Baillière, 1887)

Mollusques tertiaires du Portugal : planches de céphalopodes, gastéropodes et pélécypodes laissées - Dollfus, Gustave Frédéric, 1850 - (Imprimerie de l'Academie royale des sciences, 1903)

Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin - Königlich Preussische Akademie der Wissenschaften zu Berlin (Königliche Akademie der Wissenschaften, 1857)

Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin - Königlich Preussische Akademie der Wissenschaften zu Berlin (Königliche Akademie der Wissenschaften, 1860)

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A monograph of the Crag mollusca; or, Descriptions of shells from the middle and upper Tertiaries of the east of England - Wood, Searles V. (Searles Valentine), 1798 -1880 (Palaeontographical Society, 1848)

A monograph of the Crag Mollusca : with descriptions of shells from the upper Tertiaries of the British Isles - Wood, Searles V. (Searles Valentine), 1798 -1880 (Printed for the Palæontographical society, 1848)

A monograph of the Crag Mollusca; with descriptions of shells from the upper Tertiaries of the British Isles - Wood, Searles V. (Searles Valentine), 1798 -1880 (Printed for the Palaeontographical Society, 1848)

A monograph of the Mycetozoa; a descriptive catalogue of the species in the Herbarium of the British museum - British Museum (Natural History). Department of Botany. (Printed by order of the Trustees of the British museum, 1925)

A monograph of the Mycetozoa : a descriptive catalogue of the species in the Herbarium of the British Museum - British Museum (Natural History). Department of Botany. (Printed by order of the Trustees of the British Museum, 1911)

Monograph of the Myxogastres - Brandsten, Gustav Fredrik. (Methuen, 1892)

Monograph of the Palaeontographical Society - Palaeontographical Society (Great Britain) (Printed for the Palaeontographical Society, 1848)

Monograph of the Palaeontographical Society - Palaeontographical Society (Great Britain) (Printed for the Palaeontographical Society, 1920)

Monographie des Scalidæ vivants & fossiles. Partie 1, Sous-genre Crisposcala - Boury, E. de. (Comptoir géologique de Paris, 1886)

A monography of the Myxogastres - Massee, George, 1850 -1917 (Methuen & Co, 1892)

Monthly Magazine or British Register (of Politics, Literature and the Belles Lettres) (1825)

Morphologie und Biologie der Algen - Oltmanns, Friedrich, 1860 -1945 (Fischer, 1922)

Morphologie und biologie der algen - Oltmanns, Friedrich, 1860 -1945 (G. Fischer, 1904)

Morphologie und Biologie der Algen - Oltmanns, Friedrich, 1860 -1945 (G. Fischer, 1922)

Morphologie und Physiologie der Pilze, Flechten und Myxomyceten - Bary, A. de (Anton), 1831 -1888 (W. Engelmann, 1866)

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Muelleria: An Australian Journal of Botany - Royal Botanic Gardens (Vic.) (National Herbarium of Victoria, 1967)

Muhlenbergia - Heller, Amos Arthur, 1867 -1944 (1900)

Museum Boltenianum, sive, Catalogus cimeliorum e tribus regnis naturae quae olim collegerat Joa. Fried. Bolten .... - Bolten, Joachim Friedrich, 1718 -1796 (Typis Johan. Christi. Trappii, 1798)

Museum Boltenianum : Verzeichnis der von dem gestorbenen J.F. Bolten...hinterlassenen vortrefflichen Sammlung Conchylien, Mineralien und Kunstsachen die am 26. April d.J., Morgens um 10 Uhr öffentlich verkauft werden sollen durch den Makler J. Noodt - Bolten, Joachim Friedrich, 1718 -1796 (Conrad Müller, 1819)

Museum Calonnianum : specification of the various articles which compose the magnificent museum of natural history - Calonne, Charles Alexandre de, 1734 -1802 ([s.n.], 1797)

Museum Geversianum, sive, Index rerum naturalium : continens instructissimam copiam pretiosissimorum omnis generis ex tribus regnis naturae objectorum : quam dum in vivis erat magna diligentia multaque cura comparavit Abrahamus Gevers ... - F. C. M. (Friedrich Christian Meuschen), 1719 -1811 (Per P. et J. Holsteyn bibliopolas, 1787)

Museum Leskeanum : regnum animale quod ordine systematico - Leske, Nathanael Gottfried, 1751 -1786 (Sumptibus haeredum I.G. Mülleri, 1789)

Museum Meyerianum, sive Catalogus rerum naturalium, et nonnullarum artefactarum, quas ... suos in usus collegit Christianus Paulus Meyer, mercator quondam apud Amstelædamenses diligentissimus. Quarum publica fiet auctio, in ædibus defuncti, du 4 octobris 1802 et seqq - Meyer, Christianus Paulus. (B. Wild et J. Altheer [etc, 1802)

Museum naturalium Academiae upsaliensis cujus partem primam [-XXXIII, ultimam] - Thunberg, Carl Peter, 1743 -1828 (Typis Edmannianis, 1787)

Museum S:ae R:ae M:tis Ludovicae Ulricae reginae in quo animalia rariora, exotica imprimis insecta et conchilia describuntur et determinantur prodromi instar editum - Linné, Carl von, 1707 -1778 (Salvius, 1764)

Museum s:æ r:æ m:tis Ludovicæ Ulricæ reginæ svecorum, gothorum, vandalorumque &c. &c. &c. In quo animalia rariora, exotica, imprimis insecta & conchilia describuntur & determinantur prodromi instar editum - Linné, Carl von, 1707 -1778 (Laur. Salvius, 1764)

Museum S[euci]ae R[egin]ae M[ajes]tis Ludovicae Ulricae reginae Svecorum ... : in quo animalia rariora, exotica, imprimis insecta & conchilia describuntur & determinantur - Linné, Carl von, 1707 -1778 (literis & impensis direct. Laur. Salvii, 1764)

The mushroom book - Marshall, Nina L. (Doubleday, 1904)

The mushroom book : a popular guide to the identification and study of our commoner fungi, with special emphasis on the edible varieties - Marshall, Nina L. (Doubleday, Page and Co, 1923)

The mushroom book : a popular guide to the identification and study of our commoner fungi, with special emphasis on the edible varieties - Marshall, Nina L. (Doubleday, Page, 1902)

The mushroom book : a popular guide to the identification and study of our commoner fungi, with special emphasis on the edible varieties - Marshall, Nina L. (Doubleday, Page & Co, 1905)

The mushroom book. A popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties - Marshall, Nina L. (Doubleday, Page, 1901)

The mushroom book : a popular guide to the identification and study of our commoner Fungi, with special emphasis on the edible varieties - Marshall, Nina L. (Doubleday, Page, 1920)

The Mycetozoa of North America, based upon the specimens in the herbarium of the New York botanical garden - New York Botanical Garden. Herbarium. (The author, 1944)

Mycologia - New York Botanical Garden (New York Botanical Garden, 1913)

Mycologia - New York Botanical Garden (New York Botanical Garden, 1922)

Mycological writings of C. G. Lloyd - Lloyd, C. G. (Curtis Gates), 1859 -1926 (1902)

Mycological writings of C. G. Lloyd - Lloyd, C. G. (Curtis Gates), 1859 -1926 (1904)

Mycological writings of C. G. Lloyd - Lloyd, C. G. (Curtis Gates), 1859 -1926 (1906)

Mycological writings of C. G. Lloyd - Lloyd, C. G. (Curtis Gates), 1859 -1926 (1907)

Mycological writings of C. G. Lloyd - Lloyd, C. G. (Curtis Gates), 1859 -1926 (1908)