Earlier quoted context omitted.
The limitations of the old style encyclopedia are immediately obvious when you go to actually use it. Thousands of articles that only barely scratch the surface on the topic. Even then if you're interested in something even mildly obscure it won't be in there at all. Of course you couldn't use it as a source when writing a paper, and worst of all they didn't even provide the sourcing information for the articles that…
"Of course you couldn't use it as a source when writing a paper" Why not?
All of the above is explained in this article[1] (I just lazily searched for one).
Sources: 1: https://crk.umn.edu/library/primary-secondary-and-tertiary-s...