Lycanthropes (1991)

From the back of the book:

"Lycanthropes is a 128-page sourcebook and 2 scenarios featuring werewolves and the many other half-human, half-animal forms that legend and history have brought to life.

The sourcebook reveals the folklore behind the "wolfman," including authenticated cases that prove (to some) the actual existence of the werecreature. SAVE has compiled statistics, vital maps, case histories, and pertinent information (everything from how to recognize a werewolf on down to how to kill or even cure one) on 6 distinct types of lycanthropes, Lycanthropic Disorder, Infective, Inherent, Magical, Astral, and the Wolfen.

The Beast of Exmoor adventure scenario is based upon true-to-life, mysterious events in England, and A Long, Hot Summer is what the PCs may have to endure if they do not stop the strange happenings at Yellowstone National Park. Both scenarios feature open formats, making them adaptable to any Chill campaign. Pregenerated characters are provided, or players may use their own PCs to avert some of the oldest Creatures of the Unknown to have walked this earth...

Werecreatures."