"Weiße Spuren" ("White Trails") is a german Cthulhu scenario book published by Laurin and contains translations of two Chaosium scenarios, "The Trail of Tsathoggua" and "The Curse of Tsathoggua".
Translation of the book's back cover text:
A giant rock in the glaciers of Greenland, covered with signs in an unknown language, awakens the interest of the Miskatonic-University. An expedition is bound to solve the mystery - and stumbles upon an ancient tragedy.
In canadian British Columbia a strange ape's paw is found. Is it possible the legendary Sasquatch really exists? And what does this have to do with the disappearance of an old fellow, who's been seen in this area recently?