3 Rivers Crawl
Pandahead Productions: d20 3 (2003 )

3.Y: A What If... Supplement
Self-published: d20 3.5 (2013 PDF)

30 Character Motivations
Adamant Entertainment: Pathfinder 1 (2011 PDF)

30 Sided Adventure and Other Tales
The Armory: Generic (1990 )

30 Sided Character and Other Tales
The Armory: Generic (1986 )

30 Sided Dice Gaming Tables Revised Edition
The Armory: Generic (1982 )
The Armory: Generic (1982 )

30 Years of Adventure: A Celebration of Dungeons & Dragons
Wizards of the Coast: Generic (2004 Hardcover)
Wizards of the Coast: Generic 1 (2006 )

The 30-Sided Fantasy and Other Tales
Bob Liddil Publishing Group: Generic (1993 )
Bob Liddil Publishing Group: Generic (2008 )

3: Unnatural Encounters
Self-published: 3 1 (2009 Digest)

3:16 Carnage Amongst The Stars
Self-published: 3:16 1 (2005 PDF)
Box Ninja: 3:16 1 (2008 )
Cubicle 7 Entertainment: 3:16 1 (2009 Digest)
Box Ninja: 3:16 1 (2009 Digest)

3d6 in Order
Antediluvian Press: 3d6 in Order 1 (2011 )

Guns! Guns! Guns!
BTRC: Generic 1 (1996 PDF)
BTRC: Generic 1 (1991 )
BTRC: Generic 1 (1996 )
BTRC: Generic 1 (1989 )

3rd Era Freeport Companion
Green Ronin Publishing: d20 3.5 (2008 PDF)

3rd World
BlackWyrm Publishing: HERO 6 (2011 )