I haven't done a comparison between what is on the map on page 24 and a map of the dispatch areas or zones for each GACC. The Nevada, Utah, Oregon and Washington dispatch area map matches the air to ground, air to air frequency maps. The only GACC where this is not the case is in California with its relatively small and numerous dispatch areas.
It makes sense that initial attack aviation frequency use be based on dispatch areas as the approval of frequencies for initial attack is: dispatch center-GACC-NIFC. Some other zone arrangement would not follow this line.
zerg, I was laid up recovering from surgery in February and March. I was a captive audience as far as surfing the net to find the types of documents you post. I know how time consuming it can be. Thanks for finding these little gems!