An entire Encyclopedia Britannica set consisted of 32 huge hardcover books that gave brief histories on a wide range of topics in alphabetical order. It cost an arm and a leg, not to mention lots of the information in the texts would be outdated, so you were left with some sections that were worse than useless. Also, copying and pasting from a physical text for your research papers was way harder. It was harder to catch plagiarism back in the day, however, so that's one plus.