What has the author Jack R Hart written?

There doesn't appear to be a well-known author named "Jack R Hart". It's possible that:

* The name is misspelled. Perhaps you're thinking of a similar name like Jack R. Hart or Jack R. Hardt.

* The author is less known. It's possible this author has written smaller works, or their work is specific to a niche genre.

To help me find the author, could you please provide:

* Any other information about the author or their work, such as:

* Genre

* Approximate time period of their work

* Any titles you remember

* A possible alternate spelling of the name.

With more information, I might be able to find the author you're looking for.