* How did ppl before information age do self studies and researches on a subject when there is not google, guides and indices maintained by an online community, and especially when they dont have access to tutors and experts who are proficient in the areas? For example if one wanted to learn Latin or French by himself in 1900s. Or when someone who wanted to learn maths or history by himself. How does he know what to read, how to practise and apply the skills and knowledge etc..
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Readers guide to periodic literature was one source. It was a resource that collected and indexed a lot of articles. You could look up a subject ( fungus, super nova, North Sea Oil, ect ect) and find what had been published on that topic over the past few months.
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