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.
Also see
Estlor’s Alfheim, 8 miles per hex by Thorfinn Tait, from the Atlas of Mystara current as of 16 February 2025.