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Visit Blue Letter Bible for valuable online Bible study tools.
e-Sword is an excellent free downloadable Bible study program.
Christianbook is our affiliated partner for reading and study resources. 
Recommended Books
The Holy Spirit by R. A. Torrey 
We Have This Ministry by Samuel D. Proctor and Gardner C. Taylor
Real Evangelism by Bailey E. Smith
Letters and Papers from Prison by Dietrich Bonhoeffer
Defeated Enemies by Corrie Ten Boom