Game Mechanics for Dungeons -¶
- Old School Essentials (BX retroclone)
- Designing a Dungeon: Designing a Dungeon - OSE SRD
- Designing a Wilderness: Designing a Wilderness - OSE SRD
- Designing a Base Town: Designing a Base Town - OSE SRD
- Fantastic Medieval Campaigns (a free od&d retroclone) pg 121-133: Fantastic Medieval Campaigns by Traverse Fantasy )