An excellent resource that includes articles explaining theological topics, maps and notes to help you understand what you are reading.
Reformation Study Bible (2015) ESV
General Editor: RC Sprout
Publisher: Reformation Trust Publishing
One Volume Bible Dictionary
Hardcover: 1168 pages
Publisher: HarperOne; 3rd Revised, Updated ed. edition (March 8, 2011)
Having a detailed map of biblical locations brings the Bible alive and increases understanding.
Publisher: Hammond World Atlas Corporation (February 15, 2008)
Paperback: 63 pages