Internet in 1997. That is when the web was small enough that you did not need Google, you just used a 1200 page "internet yellow pages" book [1]
Around that time the book form became untennable so they started switching to CDROM versions [2]
[1] https://archive.org/details/luckmansworldwid0000unse_1997ed/... [2] https://archive.org/details/new-riders-www-yellow-pages-1997