Modern biology - Moon, Truman Jesse, 1879 -1946 (Holt, Rinehart and Winston, 1965)

Modern nature study : a first book for use in Canadian schools - Silcox, S. (Morang & Co, 1902)

Molecular systematics of mouse opossums (Didelphidae, Marmosa) : assessing species limits using mitochondrial DNA sequences, with comments on phylogenetic relationships and biogeography - Jansa, Sharon A. (American Museum of Natural History, 2010)

Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin - Königlich Preussische Akademie der Wissenschaften zu Berlin (Königliche Akademie der Wissenschaften, 1873)

Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin - Königlich Preussische Akademie der Wissenschaften zu Berlin (Königliche Akademie der Wissenschaften, 1876)

Monografía de los mamíferos de Yucatán - Gaumer, George F, 1851 -1929 (Departamento de talleres gráficos de la Secretaría de fomento, 1917)

A monograph of Christmas Island (Indian Ocean) - British Museum (Natural History). Department of Geology. (Printed by order of the Trustees, 1900)

A monograph of lichens found in Britain; being 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, 1894)

A monograph of lichens found in Britain; being 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, 1911)

A monograph of Nototherium Tasmanicum : genus Owen: sp. nov - Scott, H. H. (Herbert Hedley) (John Vail, Government Printer, 1915)

Monograph of the fossil Mammalia of the Mesozoic formations - Owen, Richard, 1804 -1892 (Printed for the Palæontographical society, 1871)

Monograph of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The Museum, 1972)

A monograph of the Mycetozoa, being a descriptive catalogue of the species in the herbarium of the British Museum. Illustrated with seventy-eight plates and fifty-one woodcuts - British Museum (Natural History). Department of Botany. (Printed by Order of the Trustees, Sold by Longmans [etc.], 1894)

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 Palaeontographical Society - Palaeontographical Society (Great Britain) (Printed for the Palaeontographical Society, 1871)

Monograph of the voles and lemmings (Microtinae) living and extinct - Hinton, Martin A. C. (Martin Alister Campbell), 1883 -1961 (1826)

A monograph on the structure and development of the shoulder-girdle and sternum on the Vertebrata - Parker, William Kitchen William Kitchen Parker 1823 -1890 (R. Hardwicke, 1868)

A monographic study of the American marsupial, Caenolestes - Herrick, C. Judson (Charles Judson), 1868 -1960 (Field Museum of Natural History, 1921)

Monographie der oestriden - Kaiserlich-Königliche Zoologisch-Botanische Gesellschaft in Wien. (Druck von C. Ueberreuter, 1863)

Monographs of North American Rodentia - Coues, Elliott, 1842 -1899 (Govt. print. off, 1877)

Monographs of North American rodentia - Coues, Elliott, 1842 -1899 (G.P.O, 1877)

Monographs of the United States Geological Survey - Geological Survey (U.S.) (Govt. Print. Off, 1907)

Monthly microscopical journal: transactions of the Royal Microscopical Society, and record of histological research at home and abroad - Royal Microscopical Society (Great Britain) (R. Hardwicke, 1869)

Monthly microscopical journal: transactions of the Royal Microscopical Society, and record of histological research at home and abroad - Royal Microscopical Society (Great Britain) (R. Hardwicke, 1870)

More letters of Charles Darwin : a record of his work in a series of hitherto unpublished letters - Darwin, Charles, 1809 -1882 (D. Appleton and Company, 1903)

More letters of Charles Darwin : a record of his work in a series of hitherto unpublished letters - Darwin, Charles, 1809 -1882 (J. Murray, 1903)

More letters of Charles Darwin. A record of his work in a series of hitherto unpublished letters - Darwin, Charles, 1809 -1882 (J. Murray, 1903)

A morphologic and morphometric analysis of the "Sorex vagrans species complex" in the Pacific Coast region - Carraway, Leslie N. (Texas Tech University Press, 1990)

Morphologische Arbeiten (G. Fischer, 1896)

Morphologische Arbeiten (G. Fischer, 1897)

Morphologische Arbeiten (G. Fischer, 1898)

Morphologisches Jahrbuch (Wilhelm Engelmann, 1876)