1
by Darwin, Charles
Project Gutenberg

2
by Kilner, Dorothy
Project Gutenberg

3
by Jefferies, Richard
Project Gutenberg

4
by White, Gilbert
Project Gutenberg

6
Published 2007
Conservation International

7
Published 2007
Conservation International

10
Published 2006
Conservation International

12
Published 2007
Conservation International

16
Published 2009
Conservation International

17
Published 2009
Conservation International

18
Published 2009
Conservation International

20
Published 2009
Conservation International