I've got a set of kids encyclopedias from the 1950s, the stuff in there is considered college/university level now. Calculus, algebra, all kinds of mechanical e

I've got a set of kids encyclopedias from the 1950s, the stuff in there is considered college/university level now. Calculus, algebra, all kinds of mechanical engineering stuff etc But with no physical textbooks no-one will know when stuff is removed or changed. This could be a wonderful move, but human nature says it'll be the opposite.