Moule Veni Creati is an old, well known work in studies in the Holy Spirit by Bishop (Anglican) H.G.C. Moule. It has 12 chapters. It is a deep treatment of the Holy Spirit. Although Moule was Anglican, his writings are well written and good.
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Pollock The Holy Spirit of God is a single chapter work by this brethren author. Sections: His personality, Membership in the Trinity, God's name is 2,500 in the plural, etc.
PDF: Pollock The Holy Spirit of God
theWord: Pollock The Holy Spirit of God
MySword: Pollock The Holy Spirit of God
eSword: Pollock The Holy Spirit of God