If they are old enough that if browsing a used book section you wouldn't purchase, then throw them out or recycle them. If there is some sentimental value in k

If they are old enough that if browsing a used book section you wouldn't purchase, then throw them out or recycle them. If there is some sentimental value in keeping some, like it reminds you of a cool project or team, etc. then sit down and flip thru the book with your favorite beverage. Then throw it out. If you are feeling that later on some of these books might be useful, like there is some resurgence of the tech where you can make ridiculous money as a consultant, cherish that fantasy and then throw them out.