The Complete Book of Dwarves (PHBR6), softback supplement for AD&D 2nd ed.
“Battle axes and beards. Good companions when traveling underground. Handy with tools. If that was your view of dwarves, you need The Complete Book of Dwarves. Discover 24 new character kits, new weapons, and new possibilities, including six dwarf subraces, new proficiencies, strongholds, origin myths, and a look at dwarven personalities. After reading The Complete Book of Dwarves, you may still look down on these short folk… but only to see them!”