I'm also going to add
5. Going to scholar.google.com and typing in stuff like "quantitative precipitation niobium tannic acid" and seeing what papers come up, and then using sci-hub.cc to read them. But I don't think this is a commonplace activity.
@gzt I'm jealous. sci-hub is a huge improvement (at least, as long as it lasts) but I still lack access to the ACS SciFinder database, which would allow me to find papers with much greater ease. Google Scholar is a very poor substitute
@kara_dreamer that's my jam too but also I'm an academic so I just have access to them anyway