The nature and attributes of God, including Pateriology (the person and work of the Father), Christology (the person and work of the Son), and Pneumatology (the person and work of the Holy Spirit). "Theology is the science of living to God." - Wm. Ames

General

• Proof for God - Gross 40k
• Attributes of God - AAG 25k
• Attributes of God - AW Pink 265k

The Trinity

• Essay on the Trinity - Jonathan Edwards (modernized)
  
• Biblical Doctrine of the Trinity - B.B. Warfield 115k
• Doctrine of the Trinity - Loraine Boettner
  
• Trinitarian Theology - Pastor's School 1991 235k
• Subordinationism - Kroeger
• The Trinity - A Proof - Gross 115k

Pateriology (or patriology)

• The Doctrine of God - Berkhof (link - monergism)
  

Christology

• Union with Christ - Perman

Pneumatology