Depends on how the images are being used in the book.
The Images are being used as A pitcher to enhance the relevant statement
For instance, one of the captors is called “Getting rubber to the road” and I have downloaded a photo of a wheel putting rubber down.
So more a visual demonstration to the statement.
Would a standard license cover that?
Yes, you should be fine up to a distribution of 500,000 copies. Always a good idea to also include an image credit in the book somewhere as well.