Infomagic linux developers resource

Hi, I am not crazy tech savvy at all, I am new here to find out what this is. I explore abandoned places as a hobby and I came across an antique store with an unopened box of “infomagic linux developers resource” 6 disc cd sets. I have no idea what these are but I am very curious because I love learning about any and all of my finds. It is the december 1999 version. I will post pictures in an edit when i get the outside wraps wiped and cleaned off.