There are a lot of steps to make a print in a book, and a lot of decisions that cold affect the color. Most likely, all the black and white prints were printed printed from single plates (printing plates) in a single ink, and were, thus, all the same color. Now, it is not uncommon to make separations for even the black and white photos and to try to capture the tone of the original print. A few years ago this was never done.
When you look at original photojournalism prints from earlier times, they often looked alike as well. The photographers generally made prints that could easily be turned into halftone plates. That generally meant Kodabromide F (white, glossy, smooth) or N (white, luster, smooth) paper, or some near equivalent. Sometimes photojournalists did make display prints. They were more carefully done, but often on the same papers. You do sometimes see one of these display prints on G surface paper (cream white, luster, fine grained) or, rarely, on some other surface, however. Toning was unusual for these photographers.