The Calvinistic Methodist Fathers of Wales (Tadau Methodistiaid): 2 Volumes, John Morgan Jones & William Morgan
First published in 1890 this has only just been translated into English. These immense volmes tell the story of the powerful preaching of the gospel in Wales in the 18th and 19th centuries. In case you were wondering, "The Welsh Methodists held as one body to Calvinistic doctrines."
The Remaking of Evangelical Theology, Gary Dorrien
So far I'm not impressed by the wedge that he drives between the Reformers and the Reformed orthodox views of Scripture, or with his take on Old Princeton.
A Dissertation on Divine Justice and Vindicae Evangelicae, John Owen
By far the most relevant material on the 21st century debates about the atonement.
The Authority and Interpretation of the Bible, Rogers and McKim
Whither? A Theological Question for the Times, Charles Augustus Briggs
Sharpening my knives ready for some more writing on infallibility
Scripture and Truth, Carson and Woodbridge
Antibiotics for Rogers and McKim
The New Christians: Dispatches from the Emergent Frontier, Tony Jones
The Courage to be Protestant, David Wells
Here I Stand: Bio of Luther, Roland Bainton
Plus, at a devotional and longer term preparation for preaching level, Luther and Calvin on Galatians