I believe I have a few questions more in keeping with the purpose of this email newsletter!

Years ago, I started thinking about a book on Alaska numismatics, gathering articles that I thought would show the history of the territory through its monetary instruments.

I have used some of these articles in my newsletter (with permission).

My question is this: If I have permission to reprint something, does that permission expire? I would assume that if I have permission to use it in the newsletter, I would have to get additional permission to include it in a book.

Now, if a magazine had an article I would like to include, but is no longer in business, how do I find the copyright holder?

Thanks for your help. I am sure the answers will generate more questions.