The details are below:
"This week's book giveaway is not one book, but two: Birds of Western North America: A Photographic Guide and Birds of Eastern North America: A Photographic Guide. Owls, hawks, gulls, herons, woodpeckers, jays,
sparrows, you name it. All our Facebook/Twitter followers are
automatically entered to win. The drawing is this Friday. So, tell your friends.
Here's more about the books: http://press.princeton.edu/titles/8996.html
In order to enter the drawing, all you have to do is "like" Princeton University Press on Facebook or become a fan on Twitter. Hope you will spread the good news for this give-away."
Twitter page: http://twitter.com/PrincetonUPress