It's possible:
* The name is misspelled: Perhaps there is a similar name with a slight difference in spelling. Could you double-check the name?
* The author is relatively unknown: There are many authors who publish independently or in niche genres. It's possible that "D F Dalston" has published work, but it may not be widely known.
* The name is a pseudonym: Some authors use pen names. It's possible that "D F Dalston" is a pseudonym for a more well-known author.
To find out more, you could try:
* Searching for the name with different spellings: Use variations of the name and different search engines.
* Searching online book databases: Check sites like Goodreads, LibraryThing, or Amazon to see if you can find any books listed under that name.
* Contacting a librarian or bookseller: They might have access to more specialized databases or be able to offer suggestions.
Let me know if you have any further details about the author or their work.