The chapter intro's go into some of present day St. Johns but the majority of the photographs in the book are from settlement (1870's) into the 1940's. With the exception of the chapter on the schools and it's alumni, which has some photos of sports teams (primarily basketball) going into the early 1960's, and a couple of photos of SJHS graduates (like
Stewart Udall) who are still alive, but there's really only a handful of those because it's difficult to contact and get permission to publish pictures of people who are still living.
Let me know if you have any further questions.
Cameron