When I worked for an FFRDC (technical term for think tank), we had a great library, and they always had a current Jane's for many major systems. It was a great resource, especially in the pre- and early internet days. About the time I left there in 2008, they were transitioning to online access. I think that was before Wikipedia, and I remember printing out some pages to make myself a desk references for the systems I was interested in. A couple of years later when I was entering a new field, I wanted to purchase a Jane's, but I was astounded by the price for a hardcopy book. The lab I worked at didn't have a library, so that was my only option.
Similarly (and not to derail the thread), the price of the factory service manuals has gotten crazy expensive. I used to buy them for my Toyotas, and was willing to spend $100 or $200, but when I found out the factory manual for my new truck would cost something like $1000, I ended that practice.