Of course, God's Word is at the top of the list!
The following books aren't in any particular order, just what came to mind first. It's a work in progress.
The Hiding Place by Corrie ten Boom
The Little House Collection by Laura Ingalls Wilder
The Best of A.W. Tozer 52 Favorite Chapters
Stepping Heavenward by Elizabeth Prentiss
In His Steps by Charles M. Sheldon
My Utmost for His Highest by Oswald Chambers
A Gentle Spirit
Streams in the Desert by Mrs. Charles Cowman
Mama's Bank Account by Kathryn Forbes
Aunt Jane's Hero by Elizabeth Prentiss
The Little Preacher by Elizabeth Prentiss
Christian fiction series:
Tracie Peterson's Heirs of Montana
Lauraine Snelling's Red River of the North