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Mike HarveyPickman's Model from the Mystara Mailing List posted 14 February 1998.
Rules for expanding upon non-combatant humans from the Mystara Mailing List posted 24 March 1998.
Enchantment of the Mage's Robe from the Mystara Mailing List posted 7 September 1999.
The Future of Aengmor from the Mystara Mailing List posted 23 January 2000. (with an addition by Giampaolo Agosta)
Calculations with Dominions from the Mystara Message Board posted 22 February 2001.
Sephora, The Enchantress of Sylaire from the Mystara Mailing List posted 3 March 2001.
Expanding the Multiverse from the Mystara Mailing List posted 24 September 2001.
Night of the Vampire - Audio Transcript from the Mystara Message Board posted 29 November 2007.
Ylaruam ideas from The Piazza posted 11 December 2008.
Alternatives to sinking Alphatia Mystara Mailing List posted 7 June 2010.
Alternate origin/timeline/etc for Ethengar and Traldar from The Piazza posted 24 June 2010.
Language chart for Mystara from The Piazza posted 28 June 2010.
Alternate clans of the Atruaghin from The Piazza posted 18 July 2010.
Atruaghin Clans as Picts from The Piazza posted 22 July 2010.
Implied Mega-dungeons of the Known World from The Piazza posted 20 January 2012.
Ice Elves of Adri Varma from The Piazza posted 6 December 2014.
Modules and adventures in Mystara from The Piazza posted 14 December 2015. [input also from Bouv, micky, David Keyser, JTrithen, Brian Caraway, Alex Benson, Giampaolo Agosta, Blacky the Blackball, Maladax, Kilr Kowalski, Paleologos, Robin and Dartamian]
BECMI to 5E character levels by class from The Piazza posted 11 May 2017.
Replacing Ylaruam from The Piazza posted 18 December 2017.