A very tersely written General/OpenGL API reference manual designed (as far as I can tell) to accompany General/TheOpenGLRedBook. You can find it here:

http://www.eecs.tulane.edu/www/graphics/doc/General/OpenGL-Man-Pages/opengl_index_spec.html (link broken)

The Bluebook can be found here, instead: http://biology.ncsa.uiuc.edu/cgi-bin/infosrch.cgi?cmd=browse&db=bks&fname=/SGI_Developer/OpenGL_RM/TOC&usetitle=OpenGL_RM%3aOpenGL+Reference+Manual+%28Addison%2dWesley+Publishing+Company%29&coll=0650 (sorry about the long url)

An alternative: http://tinyurl.com/2juam

Where the General/RedBook is the General/ObjC.pdf of the General/OpenGL world, the General/BlueBook is the General/AppKitTOC.html.