Gospel of the Comforter by Steele is a 36 chapter work on the Holy Spirit and different aspects of Him (1897).
Cox details the evidence for the doctrine of the Trinity in the Bible looking dozens of different angles.
Aitken Doctrine of Baptism is a 8 chapter work on baptism, looking at it from the consideration of Regeneration and Conversion.
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.
Anderson Silence of God theodicy is about when God is silent, the silence of God, which in theology it is theodicy. Why doesn’t God immediately vindicate his children.
Arminius On The Sin Against the Holy Spirit is a single chapter work on this issue by James Arminius.
John Owen – Decay of Spiritual Affections is a 12 page sermon apparently from a larger book of sermons (starts on page 250+).