If you can answer Paul's question (where did the images come from) you will be able to begin working out whether the images are in copyright. If the images are used in the UK, an author from a Berne country is entitled to claim the same protection as UK law gives to UK authors (Berne, Article 5). The UK gives life plus 70 years (sounds like a prison sentence!), meaning that a book that is 100 years old could quite easily be in copyright.

There are special, complicated rules governing US copyright term for works published prior to March 1989 (when the US joined Berne) and lawyers make a lot of money figuring them out.