4 Pages in Charles Darwin's Library associated with "people/references - Unger"

Elements of physiology.
By: Müller, Johannes. - Baly, William,
Publication info: London :Taylor & Walton,1838-1842.
Volume: v.2
Pages: Page 1479
Histoire naturelle générale des règnes organiques.
By: Geoffroy Saint-Hilaire, Isidore,
Publication info: Paris :Victor Masson,1854-1862.
Volume: v.2
Pages: Page 441
A manual of elementary geology.
By: Lyell, Charles.
Publication info: [s.n.] :[s.n.],1855.
Pages: Page 192 Page 193