I’d just like to add to all the people responding with “google didn’t exist back then” in the comments here, that libraries did exist. I found a great wealth of

I’d just like to add to all the people responding with “google didn’t exist back then” in the comments here, that libraries did exist. I found a great wealth of usable and applicable information in mathematical encyclopaedias, handbooks and software engineering books and journals (even 5 year old ones) in the public library where I live.