7 Pages in Charles Darwin's Library associated with "fauna - toad"

Essay on the physiognomy of serpents.
By: Schlegel, Hermann.
Publication info: Edinburgh :Maclachlan, Stewart & Co.,1843.
Pages: Page 198 Page 198 Page 207 Page 207
Naturgeschichte der Saeugethiere von Paraguay.
By: Rengger, Johann Rudolph.
Publication info: Basel :Schweighauser,1830.
Pages: Page 199
On the genesis of species.
By: Mivart, St. George Jackson,
Publication info: London :Macmillan & Co.,1871.
Pages: Page 109 Page 148