Did you know that Google has a News Archive Search? I didn’t until today. I don’t know the specifics as far as how many newspapers and how far back the archives go, but a quick search for news about Robert Kennedy’s 1968 assassination brought back this from the St Petersburg (FL) Evening Independent:
My search term was “R Kennedy Shot!”, which was the headline for the next morning’s edition of the Fort Worth Star-Telegram. I can still see clear-as-day that newspaper headline as my Dad sat at the kitchen table reading the newspaper that morning! One of those things you never forget, I guess. I was only 10 years old at the time and just beginning to become aware of world events, I think.
Anyway, this could be a very handy resource!