Thank you for sharing your findings with us! I am familiar with the "Charlie Chandler" books. They make for fun reading! I will take a look at the others you mentioned.
Speaking of books, there was that Charlie Chan book where he goes on a cruise with his family that you talked about. I can't help being devoted to Mr Biggers myself, but I'am curious what you thought of it. Also I see by your comments that there is a new Charlie Chan tea. Have you tried it yet?