joe selvin to put words to jim's art. >> obnoxious, profane. but if jim marshallwas your friend, you had a friend for life. >> reporter: joe wrote the history behind hundreds of jim's photos. >> it's a moment of time that was over before anyone knew what was happening. these pieces of history will never happen again. they also had the ability to really blend in so he never stood out. so people forgot he was there. so he could get those very intimate moments. >> it is a moment in time frozen and framed. >> he may been somewhere photographing a musician, but he was also working around and seeing what else was going on at the time. a lot of photographers didn't do that. they didn't have that curiosity. >> reporter: a curiosity that captured bay area history and it came from a notebook buried in photographs. >> we finished what he started and i think he would be proud of it. >> reporter: in san francisco, cate caugurian, kpix5. >> what is it saying? if you remember the 60s , you probably weren't there. [ laughter ] that book was just released today. the city will proc