1988 · ソースブック（プレイを拡張するルール／オプション）
Das Cthulhu Quellenbuch
This sourcebook for the Call of Cthulhu roleplaying game provides background for creating realistic adventures set in the 1920s, including additional information on Germany. It covers historical events and catastrophes, notable personalities, prices, travel, transportation, archaeology, cults, Mythos books, libraries, sages, and their customs. New rules cover subjects such as diving and weapons, while new creatures range from eagles to zombies. Maps, floor plans, illustrations, summaries, and adventure suggestions support both players and the Keeper.
スキルベース（スキルを購入または獲得）属性／ステータス制（STR、CON、PERなど）ランダム属性生成（キャラクター作成時）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。