Minecraft wiki entry for Trapdoor, associated text: 1 Obtaining
1.1 Breaking
1.2 Natural generation
1.3 Crafting
2 Usage
2.1 Properties
2.2 Barrier
2.3 Redstone component
2.4 Fuel
2.5 Note Blocks
3 Sounds
3.1 Generic
3.1.1 Iron
3.1.2 Wood
3.2 Unique
4 Data values
4.1 ID
4.2 Block states
5 Video
6 History
7 Issues
8 Gallery
9 References