I came across this book when I was looking at reference Bibles. Reference Bibles only have 80-90,000 cross references but this book has 500,000. It has helped me to use the Bible as a commentary on the Bible. There are two things to note though: 1) the print is small so expect to use a magnifying glass. 2) this book is old, I think it is in the public domain, and free software like E-Sword include the digital version of this book for free. I personally use both, digital and hard copy in my studies. God bless.