Site maintenance lasting 1 hour is scheduled to begin at 5:00PM CST on September 16, 2014.
- Das Abändern der Vögel durch Einfluss des Klima's.
By: Gloger, Constantin Wilhelm Lambert,
Publication info: Breslau :August Schulz & Co.,1833.
Pages: Page 140
- The regions of vegetation, being an analysis of the distribution of vegetable forms over the surface of the globe in connection with climate and physical agents.
By: Hinds, Richard Brinsley.
Publication info: London :G.J. Palmer,1843.
Pages: Page 11 front slip
- Researches into the physical history of mankind.
By: Prichard, James Cowles.
Publication info: London :Sherwood, Gilbert & Piper,1836.
Pages: Page 61
- Supplement to the fifth edition of A manual of elementary geology.
By: Lyell, Charles.
Publication info: London :John Murray,1857.
Pages: Page 3