Plumer is one of the most outstanding Reformed writers. He is a very clear Reformed author of the 19th century. Logos has published his wonderful Psalms commentary but there are many other works by him that really need to be included in the pipeline.
http://www.sprinklepublications.net/william-s-plumer.html
The Wikipedia page is incorrect.
Jeremy Walker has a review of his Helps and Hints in Pastoral Theology here. I was thinking of suggesting it as part of a Classic Works on Pastoral Theology collection, but a whole Plumer set would be good too!
Here's a bit more about him:
William S. Plumer (1802-1880): American Presbyterian minister and graduate of Old Princeton; it has been said that among 19th century Reformed writers, “none was more doctrinally sound, experientially searching, and practically realistic”; known as pre-eminently a preacher of the Gospel, while a contemporary described his public prayers as “the tender pleadings of a soul in communion with God.”
https://www.logos.com/product/38401/commentary-on-pauls-epistle-to-the-romans