These are the best ones...
David Royal - A Collector's Guide to the Savage 99 Rifle and it's Predecessors (2016)
Rory Reynoldson - The Savage 99 Pocket Reference (2021)
...by the 24HourCampFire guys!!!
I'll give these a honorable mention cause they also have my name listed...
Bailey Brower - Savage Pistols (2012)
Peter Zimmerman - Savage Ammunition (Revised 3rd Edition) (2002)