What has the author Gladys Munnings written?

It seems you're asking about an author named Gladys Munnings. However, there is no widely recognized author by that name.

It's possible you might be thinking of:

* Gladys Mary "G.M." Munnings, an English painter who was known for her horse portraits and landscapes. She was married to the renowned equestrian artist Sir Alfred Munnings.

* Another author with a similar name.

If you can provide more details about the book or work you're looking for, I might be able to help you find the correct author.