Many of Jack Coggins's books may still have current copyright protection in his name - some of Jack's illustrations are covered by copyright held by publishers and/or other authors.
However, due to the fact that copyright management of Jack's work has passed from company to company, I have lost the trail and have no idea who is currently handling copyright of his work, if in fact anyone is doing so.
I suggest that anyone wishing to use any of his works for commercial purposes contact the original publishers of the books, if they are still in business. For those who wish to use the works for non-profit publication, or on a temporary basis, it may just be easier to go ahead and do so.
All Artworks Copyright © Jack Coggins