David VanDrunen just passed along an off print of his essay, “The Two Kingdoms Doctrine and the Relationship of Church and State in the Early Reformed Tradition” published in Journal of Church and State 49 (2007): 743-63. You can order single issues or subscribe here. Otherwise you can get copies of this essay at your nearest public library via inter-library loan. This material will also appear I think in his forthcoming volume on this topic.