I have now added the Roper pages to the All of Life redeemed site. Duncan is a NZ reformational thinker. His paper on Euler and the Konisberg bridges: some lessons for the philosophy of mathematics is now available.
I've also put up a pdf of Gregory Baus's paper on Dooyeweerd's societal sphere sovreignty: neither tax based nor laissez-faire. Gregory also gets a mention on Joe Carter's Evangelical outpost.