Acres of Diamonds is written by Russell Conwell. This is actually a speech which he has given in the early part of the 20th century. He has given this speech over 5000 times. The book is all about inspiration. The book explains how we overlook riches in our own backyards while we wonder around.

Its quite interesting to see how such a relevant topic to modern days was discussed so vividly almost a century ago. You can easily find the book free on the internet.