Estlor
Fitting Mystara into the Spelljammer and Planescape settings from the Mystara Mailing List posted 12 October 1995. (original article by Leroy Van Camp III)
Clerics of Immortals from the Mystara Mailing List posted 4 July 1996.
Future Timeline from Estlor's Campaign from the Mystara Mailing List posted 5 July 1996.
Niponeria from the Mystara Mailing List posted 5 July 1996.