How many books has Tony Ross written?

It's impossible to give an exact number for how many books Tony Ross has written. While he is a prolific author and illustrator, his work is often collaborative. He might illustrate books written by others, and he might co-write books with other authors.

To find out more, you can search for his books on websites like:

* Amazon: Search for "Tony Ross" and browse the results.

* Goodreads: Search for "Tony Ross" and see his author page.

* The British Library: Search for "Tony Ross" in their catalog.

These websites will likely provide a good overview of his work, although they may not list every single book he's contributed to.