Consider Jesus Devotional for 31 days by Octavius Winslow
Mackenzie Throne of Grace is a 11 chapter work on prayer and our security before the throne of God even though we are still sinners.
Methodist Dunn’s Mission of the Spirit is a work on the Office and work of the Holy Spirit in Redemption. 19 chapters. 1872
Charles Hodge’s great systematic theology work is a well known Reformed/Calvinist theology. It is extensive.
Expositions of Holy Scripture Genesis is a commentary on the book of Genesis.
Prayer Availeth Much 13 chapter work on prayer examines prayer issues. Doubting, Desire, peace God’s answer, asking and receiving, seeking and finding, Christ’s will.
Sermons by EM Bounds. Most of the sermons are on prayer in one form or another. Some of these are from his books it appears, and others are just rare copies of an EM Bounds Sermon.