What has the author Frank Stiffel written?

There is no known author named "Frank Stiffel." It's possible there's a typo in the name, or that the author goes by a different name.

To help me find the correct author, could you please provide any additional information you have, such as:

* The genre of their work: (e.g., fiction, non-fiction, poetry, etc.)

* The time period they wrote in: (e.g., 20th century, contemporary, etc.)

* Any specific titles of their books or stories: (e.g., "The Great Gatsby", "Pride and Prejudice", etc.)

* Any other details about the author: (e.g., nationality, profession, etc.)

With more information, I can help you identify the author you're looking for.