What has the author Walter Petto written?

There is no widely recognized author named Walter Petto. It is possible that this is a misspelling or a name that is not commonly known.

To find out if there is an author with a similar name or if you have the name wrong, you could try:

* Searching online book databases: Websites like Goodreads, Amazon, and WorldCat allow you to search for authors and their works.

* Checking library catalogs: Search for the author's name in your local library's catalog.

* Asking a librarian: Librarians are trained to help you find information about books and authors.

Please provide more context or information if you remember any other details about the author or their work.