Gospel of the Comforter by Steele is a 36 chapter work on the Holy Spirit and different aspects of Him (1897).
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.
Teasley Holy Spirit and Other Spirits is about the Holy Spirit’s effect on the believer as wells as how other spirits (demons) try to affect mankind with specific unholy spirits.
Arminius On The Sin Against the Holy Spirit is a single chapter work on this issue by James Arminius.
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.
Epp-The Devil Exposed is 12 chapters on different aspects of the Devil, demons, Satan, and man. Temptation, trials.
Steele – Love Enthroned is a work on what is love, its different aspects, biblical examples, etc. 23 chs.