Answer:
You used to come to me for all sorts of information and knowledge before the internet was born
found at the back of the book.
I have a head and a tail but my eyes can never see my tail.
The more you work the more I'll eat.You keep me full I'll keep you neat.
I may be made of metal, bone, or wood and have many teeth. My bite hurts no one and the ladies love me. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?