* The name is misspelled: Perhaps the author's name is slightly different. Could you double-check the spelling?
* The author is obscure: It's possible the author is lesser-known, writing in a specific niche or genre.
* The author uses a pen name: Many authors use pseudonyms.
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* Any additional details about the author or their works: Do you know the genre they write in, any specific titles, or the time period they published in?
* Any other context: Where did you encounter this name?
With more information, I can try to help you find out more about Ralph Ewing Clark.