Lego - a company in Denmark - is derived from the words "Leg Godt" - meaning "play well."
Certainly those of us and our kids - who've played with Lego have played well for decades.
This book - The World of Lego Toys by Henry Weincik was published in 1987. It's been around for awhile. I remember buying this in 1994. It is one of the first toy books I had ever seen by that time.
You can purchase the book used from Amazon for about $4-7. A very good deal.
The book takes the reader through the history of the Lego company up until 1987. A great resource for any Lego enthusiast.