What has the author John H Zittle written?

There does not appear to be a published author named "John H Zittle."

It's possible:

* The name is misspelled. Could you double-check the spelling?

* The author uses a different name. Are there any other names or initials associated with this author?

* The author is not well-known. If this is the case, it might be difficult to find information about them online.

Please provide more information if you can, and I will be happy to help!