Copy to browser and read pages ix, 37 and 38.

http://books.google.com/books?id=EoB7-8GIDr8C&lpg=PP1&dq=buzzards%20and%20butterflies%20judah&pg=PP1#v=onepage&q&f=false

Reference Data:

Buzzards and Butterflies, by J.C. Judah, 2008