In Touch with a Planet 
by S.D. Gordon 

Prayer, The Root and Strength of All Work
by Andrew Murray 

D. L. Moody's Intercessor
by S.D. Gordon 

Asking Great Things of God
by Samuel Logan Brengle 

Pray On! Pray On!
by George Muller 

The Prayer Hearing God
by George Muller 

Prayer and Humility
by E.M. Bounds 

Prayer and Devotion
by E.M. Bounds 

The Universality of Prayer
by E.M. Bounds 

The Power of a Hidden Life
by A.J. Gordon