Related Clues:

• Place to see the world
• Assistant in a Herculean labor
• Quick-reference aid
• At fifty, like an underworld character?
• Calypso's father
• Holder of legends
• Book with maps
• Certain type of reference book
• Back-of-book listing
• Geography buff's book
• Back-of-bio feature
• Globe trekker's book
• A two-dimensional world
• Back-of-the-book reference section
• Titan's assault sounded in retreat?