What has the author Harold Connolly written?

It appears you're asking about the wrong Harold Connolly. The name "Harold Connolly" is most famously associated with the American Olympic hammer thrower, not an author. He was a gold medalist at the 1956 Olympics and a four-time Olympian.

There might be another Harold Connolly out there who is an author, but without more information, it's impossible to say.

To help me find the author you're looking for, please provide more context, such as:

* What kind of books does he write? (fiction, non-fiction, genre)

* Do you remember any specific titles or subjects?

* Do you know anything about his background or nationality?

Once I have more information, I can try to identify the correct author.