These AD manuals were provided by David Goodsell 1/17/2012:
4.0 from Nov 2 2005
4.1 from Apr 15, 2009
4.2 from Feb 25, 2010

Note:
AutoDock4.0_UserGuide.doc is 786KB and was originally named AutoDock4.0_UserGuide.MSWo~1.doc
AutoDock4.1_UserGuide.doc is 1MB and was originally named AutoDock4.1_UserGuide
AutoDock4.2_UserGuide.doc is 2MB and was originally named AutoDock4.2_UserGuide.doc
