Aitken Doctrine of Baptism is a 8 chapter work on baptism, looking at it from the consideration of Regeneration and Conversion.
Devotional Thoughts by Aitken is many chapter devotional work on various Christian life issues and topics.
Timothy Lin work of the Fruit of the Spirit is a short 1 chapter work about the Holy Spirit and the fruit of his indwelling in the believer.
In Smeaton – The Doctrine of the Holy Spirit he examines historically what the Bible teaches about the Holy Spirit. This is an old classic work (1862). In the New Testament portion he looks at topics.
Biderwolf-A Help to the Study of the Holy Spirit surveys, names of the Spirit, advent, personality, deity, sealing by, anointing of, fruits, baptism of, filling of, emblems, resistance of the Spirit.
The Holy Spirit and You – By Frau Dr. Gertrud Wasserzug. A short 5 chapter work on the Holy Spirit and the life of a Christian, the church, the world, the servant of the Lord.
In this 31 chapter (month devotions) book by Andrew Murray (Deeper Life, Dutch Reformed), he examines the spirit of Christ