I've written about Ricky Riccardi in previous posts. He is the Archivist at the Louis Armstrong House Museum in Queens, New York, and earlier this year Pantheon brought out his book about Armstrong: What a Wonderful World: The Magic of Louis Armstrong's Later Years. The book, which I recently read (in advance of interviewing him about it, on "Radio Once More"), is terrific, and can be found at the following amazon link:
http://www.amazon.com/What-Wonderful-World-Magic-Armstrongs/dp/0307378446/
Here, too, is the link for Ricky Riccardi's popular Armstrong-related blog:
http://www.dippermouth.blogspot.com/