* The name is misspelled. Check for variations in spelling.
* The author uses a different name. Some authors use pen names or aliases.
* The author is relatively unknown. It's possible that Harry Wagschal is a lesser-known writer or has written in a niche genre.
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* Do you know anything else about the author or their work? (e.g., genre, style, approximate publication dates)
With more details, I might be able to assist you in finding the author's works.