Dark Folk is a supplement for fantasy role-playing games published by Mayfair Games in 1983.
Fantastic Treasures II is a supplement for fantasy role-playing games published by Mayfair Games in 1985.
Dragon's Hall is a supplement for fantasy role-playing games published by Judges Guild in 1981.
Wizards is a supplement for fantasy role-playing games published by Mayfair Games in 1983.
Dwarves is a supplement for fantasy role-playing games published by Mayfair Games in 1982.
Elves is a supplement for fantasy role-playing games published by Mayfair Games in 1983.
Dragons is a supplement for fantasy role-playing games published by Mayfair Games in 1986.
Judges Guild is a game publisher that has been active since 1976.
 The company created and sold many role-playing game supplements, periodicals and related materials, but became best known during the late 1970s and early 1980s as one of the leading publishers of "Dungeons & Dragons" related materials.
 Its flagship product, "City State of the Invincible Overlord", was the first published RPG supplement to feature a fully developed city environment.
 The supplement was followed closely by numerous ancillary cities, maps, and other materials published by Judges Guild.
Fantastic Treasures is a supplement for fantasy role-playing games published by Mayfair Games in 1984.
Witches is a supplement for fantasy role-playing games published by Mayfair Games in 1990.

Question:  Dragon's Hall is a supplement for fantasy role-playing games published by a commpany active since what year?
Answer: 1976