What has the author Dorothy Hallarn Mercy written?

It appears you are asking about an author named "Dorothy Hallarn Mercy". However, there is no known author with that name. It's possible you may have made a typo or the name is slightly different.

To help me find the author you're looking for, could you please double-check the spelling and provide any other details you know about them? For example:

* Are you sure about the middle name "Hallarn"?

* Do you know any other books they have written?

* Do you have any information about their genre or time period?

With more information, I can better assist you in finding the author and their works.