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Mélanges biologiques tirés du Bulletin de l'Académie impériale des sciences de St. Pétersbourg - Imperatorskai︠a︡ akademīi︠a︡ nauk (Russia) (Eggers et comp, 1891)

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Mémoires du Muséum d'histoire naturelle - Muséum national d'histoire naturelle (France) (G. Dufour, 1819)

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Mémoires présentés à l'Académie impériale des Sciences de St. Petersbourg par divers Savans et dans ses assemblées - Imperatorskai︠a︡ akademīi︠a︡ nauk (Russia) (1849)

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Mental evolution in animals. With a posthumous essay on instinct - Darwin, Charles, 1809 -1882 (D. Appleton, 1884)

Métamorphoses moeurs et instincts des insectes (insectes, myriapodes, arachnides, crustacés) - Blanchard, Emile, 1819 -1900 (G. Baillier, 1877)

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

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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)

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)

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The microscope and its revelations - Carpenter, William Benjamin, 1813 -1885 (W. Wood & Co, 1883)

The microscope and its revelations - Carpenter, William Benjamin, 1813 -1885 (Blanchard and Lea, 1856)

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The microscope, and some of the wonders it reveals - Houghton, W. (William), 1828 -1895 (Cassell, Petter, & Galpin, 1875)

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The microscope : its history, construction, and application ; being a familiar introduction to the use of the instrument and the study of microscopical science - Hogg, Jabez, 1817 -1899 (G. Routledge, 1858)

The microscope : its history, construction, and application, being a familiar introduction to the use of the instrument, and the study of microscopial science - Hogg, Jabez, 1817 -1899 (George Routledge, 1867)

The microscope : its history, construction, and application, being a familiar introduction to the use of the instrument and the study of microscopical science - Hogg, Jabez, 1817 -1899 (G. Routledge and Sons, 1871)

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Mindeskrift i anledning af hundredaaret for Japetus Steenstrups fodsel udg. af en kreds af naturforskere ved Hector F.E. Jungersen og Eug. Warming. Udgivelsen bekostet af Carlsbergfondet - Warming, Eugenius, 1841 -1924 (B. Lunos bogtrykkeri, 1914)

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