Greg Nichols is the author of Covenant Theology: A Reformed and Baptistic Perspective on God's Covenants. These lectures correspond to the features of his book. They are truncated due to time constraints, but the lectures are still extremely helpful even in their condensed form.
God's Covenants: Academy Class
Source: Sovereign Grace Audio Treasures
General Introduction to God's Covenants, Part 1
General Introduction to God's Covenants, Part 2
Biblical Revelation of God's Covenants
Eternal Counsel of Redemption
Creation Prohibition - The Covenant of Grace
The Noahic Covenant
The Abrahamic Covenant, Part 1
The Abrahamic Covenant, Part 2
The Old Covenant, Part 1
The Old Covenant, Part 2
The Davidic Covenant
The Messianic Covenant
The New Covenant
God's Covenants: Sunday School Class
Source: Sovereign Grace Audio Treasures
The Abrahamic Covenant: Major Features, Part 1
The Abrahamic Covenant: Major Features, Part 2
The Abrahamic Covenant: Fulfillment
The Abrahamic Covenant: Significance, Part 1
The Abrahamic Covenant: Questions & Answers
The Messianic Covenant, Part 1