Related Clues

• Aeschylus' "Oresteia," e.g.
• Three-part work
• "The Lord of the Rings" movies, e.g.
• "The Lord of the Rings" movies, e.g.
• "The Hitchhiker's Guide to the Galaxy" five-part series, jokingly
• Lightfoot's "Railroad ____"
• Each of the titles in this puzzle's theme answers, e.g.
• Tolkien's "The Lord of the Rings," for one
• Dante's "The Divine Comedy," e.g.
• "The Lord of the Rings," among others
• Group of three works
• Set of three
• Group of three literary works
• Essay about one mathematical function in three volumes?
• Story in three parts
• Attempt to incorporate one book in a cycle
• "The Lord of the Rings," e.g.
• Toy girl broke in three works!
• Essay about one mathematical function in three volumes?
• Three-part series