The Southwest Border section of Western Whitewater includes the Lower Rio Grande, Gila, San Francisco, Salt & Verde.
It breaks the Gila down into five runs: Grapevine CG to Mogollon Creek (III, 41m.), USFS Rd. 809 to Redrock (III, 18m.), Redrock to New Mexico 92 bridge (I+, 20m.), Old Safford-Clifton Road to Bonita Creek (II, 19m.), and the Lower Gila below Coolidge Dam. There's a total of 6 pages of info on the Gila followed by 2 pages of essay.
We use the book more as a day-dream initiator than a source of really good river beta. It does, however, list guidebooks and maps for each river. It also shows an average annual hydrograph. For most sections there's a couple to several page general description followed by a mileage guide that points out the biggest rapids. It's enough to get your logistics figured out, if you're doing a section that's covered in the book.
I think the biggest limitation is that it basically covers the classics, so is more help for rafting than kayaking.