* The name is misspelled: There might be a different spelling for the author's name, or you might be thinking of a different author altogether.
* The author is relatively unknown: It's possible the author is not widely recognized and has published under a pseudonym or in a niche genre.
* The author is a local or regional writer: Their works might be available in specific libraries or archives, but not widely distributed.
To help identify the author, please provide any additional information you have, such as:
* Genre of their work: What type of books does Samuel Judson Porter write?
* Titles of their works: Do you remember any specific book titles by this author?
* Era of their work: When do you think the author was active?
With more information, I might be able to find more details about this author.