From the publisher's page:
Welcome, globetrotters, to the Leagues’ largest and most diverse guide to Victorian adventure and ingenuity!
Drawn from the best minds from across the Leagues, this supplement contains new Talents, Leagues, Flaws, Gadgets, Weapons, Vehicles, and Living Creations, Magical Texts and Artifacts, Locations, Dinosaurs, and Villains. As if that wasn’t enough, there is information on the British Army and the major navies of the late 1890s. Rounding it off is a plethora of sample characters and henchmen.