Quote Originally Posted by baglock1 View Post
Hi Bob,

I doubt you're going to have any problems. Legally, there is really no one alive to claim an infringement unless the next of kin decides to claim it as inherited intellectual property. And personally, if my family were the type to do that, I don't think I'd care much about preserving the history of them. YMMV.

Seriously, with no copyright markings, you shouldn't have any problems with it. If the copyshop says they can't do it, tell them it's your product.
bolded the important part.

You making this post have documented a history the next of kin could use for a claim, if they wanted to. It has not been long enough to go public domain by your statement.

If really concerned about it, ask around in the family.

I would add a page though. "created by XYZ in 19xx" should at least be on there. possibly a reprinted by XYZ as well.

that way at least the content creator is acknowledged.