Dwarf:

Constitution: +1 to Constitution —Advanced Dungeons & Dragons Edition 1 Player’s Handbook

Elf:

Dexterity: +1 to Dexterity —Advanced Dungeons & Dragons Edition 1 Player’s Handbook

Weapons Use: An elf who multiclasses in fighter and magic-user may cast spells while armor clad —Advanced Dungeons & Dragons Edition 1 Player’s Handbook

Halfling:

Dexterity: +1 to Dexterity —Advanced Dungeons & Dragons Edition 1 Player’s Handbook

Human:

Ability Scores: +1 to All Ability Scores —Advanced Dungeons & Dragons Edition 5 Player’s Handbook