Last month, for the occasion of celebrating Reformation Day 2020, Prof. B. Huizinga (professor of Dogmatics and Old Testament) gave a lecture in Crete (IL) PRC, titled "Of God, Through God, to God: Our Covenant Doctrine as Protestant Reformed Churches."
Among the doctrines that the Reformers revived and developed in the sixteenth century was the doctrine of God's everlasting covenant of grace with His people in Jesus Christ.
Standing on those shoulders, Prof. Huizinga in this lecture explains the doctrine of the covenant taught, developed, and defended by the Protestant Reformed Churches in America throughout her history.
You are encouraged to listen to this edifying and encouraging lecture at the link provided above.