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.
Perryman-How to Resist the Devil, is a 58 page work on resisting Satan, surveying field operation, areas of deception and opposition, and means of victory
Epp-The Devil Exposed is 12 chapters on different aspects of the Devil, demons, Satan, and man. Temptation, trials.
Bounds, in Satan, His Personality Power and Overthrow, shows with irrefutable logic backed by the testimony of Holy Scripture, that the Arch Enemy of mankind to be a Person— actual, literal, ever active for the destruction of human souls. Indicates whereby Christian believers can withstand his assaults and how they may finally triumph.
Davison, W.T. – The Indwelling Spirit is a 1911 work with 16 chapters on the indwelling Holy Spirit in us. Gifts, Fruit, prayer, tides, plenitude, spirit of Truth, etc.
In this book, Pastor Morgan deals with some of the great moments in the life of Christ: His Birth, His Baptism, the Temptation, the Transfiguration, the Crucifixion, the Resurrection, the Ascension, the answer of Christ (which is Man Redeemed).
Dr. Luginbill wrote these notes on the Holy Spirit or on Pneumatology. This is basically a very good doctrine of the Holy Ghost.