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I subscribed to all sorts of newsletters, and at least one was dinosaur specific. I would also write professors at local colleges with questions and usually get a response.
Also worked at the library and could order just about any book available. At that point most libraries would order books if they didn’t have them already.
But mostly newsletters and science journals until BBS became more common and user friendly when we first started having available computers.
In my experience, people tend to not want things that don’t benefit them directly.
If they don’t use the bike lanes they don’t want them to take up what could be a car lane they would use.