Robert Shaw’s short 1 chapter work on God and the Holy Trinity is an excellent collection of observations and verses that defend the Trinity.
Another Gordon Quiet Talks series about those who win against the world, and winning forces, Jesus, Holy Spirit, etc.
Warfield Person and Work of the Holy Spirit is a 15 chapter work on various central elements of the doctrine of the Holy Spirit.
Berry Adventures in the Land of Canaan is a devotional work about Israel entering into the promised land as a parallel to our spiritual warfare towards our sanctification.
John Owen – Decay of Spiritual Affections is a 12 page sermon apparently from a larger book of sermons (starts on page 250+).
Winslow in Christ and the Christian in Temptation examines how Satan tricks the Christian into falling into sinful conduct. These elements are the keys by which Satan tricks us.
Steele – Love Enthroned is a work on what is love, its different aspects, biblical examples, etc. 23 chs.