Edition 1 - 1975 |
Edition 2 - 1978 | Edition 3 - 1979 | Edition 4 - 1996 |
|---|---|---|---|
| Listen in total darkness, or in a very large room, very quietly | In total darkness, or in a very large room, very quietly | ||
| Shut the door and listen from outside | Go outside. Shut the door. | ||
| Up | Down | To the Stratigraphic Record |