What has the author Bill Roberts written?

There are several authors named Bill Roberts. To give you the most accurate information, could you please provide some additional context? For example:

* What is Bill Roberts's area of expertise? (e.g., fiction, non-fiction, science, health, etc.)

* Is there any specific book title or subject you're interested in?

* Do you have any other information about this author, such as their location or website?

With more information, I can help you find the right Bill Roberts and identify his works.