* The name is misspelled: Perhaps you're thinking of a similar name, like "Herman Stuart Cottam" or "Herman S Cottman"?
* The author is relatively unknown: If they've written niche works or are a local author, they might not have widespread recognition.
* The author is unpublished: They might have written works that were never published or are self-published.
To get more information, you might try:
* Checking local libraries and bookstores: If you know where the author might be from, their works might be available locally.
* Searching online literary databases: Try searching for the author on websites like Goodreads, LibraryThing, or even Amazon.
* Consulting with a librarian: Librarians are excellent resources for finding information about books and authors.