What has the author WH Mill written?

There is no known author named "WH Mill". It's possible you're thinking of a different author or have misspelled the name.

Could you please double check the name or provide more context about the author you're looking for? This could include:

* Other works by the author: Do you know any other books or pieces they have written?

* Genre: What type of writing are they known for (fiction, non-fiction, poetry, etc.)?

* Time period: When did they live and write?

With more information, I can help you find the correct author and their works.