content: In addition to the Bible , the four basic key aids for study are a bible atlas, bible dictionary, concordance, and last but not least a good handbook. After some research, it was clear that Halley's was far and away the most revered and trusted. I found most useful the background and history of biblical people and events that which have made the scriptures come alive. I am amazed how he packed so much information in this relatively small volume. Highly Recommended.