I’m helping hosting a photography competition for a class and I want to buy a photography book for the winner as I imagine they’ll be some what interested in the subject

I want to buy a book like “most influential photographs of all time” to keep their attention whilst also letting them learn something. I’m just worried if the book will contain photographs not suitable for a child like nguyen’s execution or some shit.

Know any safe non political / non gruesome photography books I could buy with the same topic?