Some important material demonstrating that the PRC (Protestant Reformed Church) is part of the Great Whore:
http://www.outsidethecamp.org/noprcsgceagc.htm (“Why we no longer endorse the PRC, SGC, EAGC”).
http://www.outsidethecamp.org/efl168.htm (“Correspondence with a member of the Protestant Reformed Churches, adding to the evidence that that the PRC is a false church”).
http://www.outsidethecamp.org/prcantithesis.htm (“The PRC’s Imaginary Antithesis”).
http://www.outsidethecamp.org/nohoeksema.htm (“Why we no longer endorse Herman Hoeksema”).
http://www.outsidethecamp.org/efl86.htm (“Allen Baird (Covenant PRC, British Reformed Fellowship): ‘Therefore, it is my opinion that the difference between us an ordinary Arminians is only one of degree'”).
http://www.outsidethecamp.org/letters31.htm (“Radical to the Extreme?”)
http://www.outsidethecamp.org/efl218.htm (“Letter to David Engelsma re: review of Arminian Theology: Myths and Realities”).
http://www.outsidethecamp.org/efl180.htm (“Letter to David Engelsma re: review of From Heaven He Came and Sought Her: Definite Atonement in Historical, Biblical, Theological, and Pastoral Perspective”).
http://www.calvinism.us/2015/06/correspondence-with-herman-hanko-of-prc_16.html (“Correspondence with Herman Hanko of the PRC on Paul Elliott and J. Gresham Machen”).