I don;t know how many libraries still have their bound volumes of old magazines, but if you can find them, Life magazine would be a great start.
Update: I just found that Google books has all the issues from 1935 to 1972. But if you can find paper copies, it’s a lot better. It was large format, and they had a fantastic staff of photographers.
I think it’s no longer considered politically correct but I loved reading Black Like Me when I was a kid.
I think The Outsiders was from that time period too.