I usually post as I go so it’s usually just whatever paper I’m reading at the time! I’ve posted a lot from the St Louis Post Dispatch, Boston Post, Tacoma Times, Oakland Tribune, etc (and I still go back to those ones!). Sometimes I search for something specific (like, the year 2000) and then I get results from all over, but I think it’s more fun to see whatever comes up “organically” in each paper.