The elements of experimental embryology - Huxley, Julian, 1887 -1975 ([Hafner Pub. Co.], 1963)

Elements of the comparative anatomy of vertebrates - Wiedersheim, Robert, 1848 -1923 (Macmillan, 1886)

Elements of the comparative anatomy of vertebrates - Wiedersheim, Robert, 1848 -1923 (Macmillan, 1897)

Elements of the comparative anatomy of vertebrates - Wiedersheim, Robert, 1848 -1923 (MacMillan, 1886)

Elements of the comparative anatomy of vertebrates - Wiedersheim, Robert, 1848 -1923 (Macmillan and co, 1886)