Frogs.

A comparative methods approach to the study of oocytes and embryos edited by Joel D. Richter 1999 Handbook of frogs and toads of the United States and Canada Wright, Albert Hazen 1995 The biology of the frog Holmes, Samuel Jackson 1927 The biology of the frog Holmes, Samuel J. 1906 The frog Marshall, Milnes 1928 The frog Marshall, A. Milnes 1909