I believe Supplement 1 is Seismic design of steel.
So, you would be better served to go to the current version, AISC 341-05.
This is the one referenced by the new 13th addition AISC [Steel] Construction Manual, aka AISC 360-06.
The AISC 360-06 is referenced from the current building code, the IBC 2006.
However, this version funnels you into LRFD.
You could also try AISC 341-02, if that is easier to use.
Best wishes!