Log College Press has recently added several expositions of the Westminster Standards which you may wish to download for further study.
Robert Annan (1742-1819) wrote an Exposition and Defense of the Westminster Assembly's Confession of Faith in 1787, which was republished with notes by David McDill (1790-1870).
John McDowell (1780-1863) published in two volumes a series of sermons on the Westminster Shorter Catechism.
Edwin Hall, Sr. (1802-1877) published The Shorter Catechism of the Westminster Assembly, With Analysis and Scripture Proofs.
Our database of resources on the Westminster Standards continues to grow. Please check back with us for more such confessional studies from early American Presbyterians.