suggest me openGL api reefernce ebook

greetings all,
i am new to openGL. i am in need of opengl reference guide. online copy is available but i cannot access it al the time.
can any one link me pdf or chm file…

feel free to mail me at
ashwini.dubey@hotmail.com

wget -r http://www.opengl.org/sdk/

thanks for ur contribution…
i just needed that…