district air crossing - drill hole collar
- district air crossing
- district bunker
- district geologic map
- district gravity incline
- district incline
- district wide sample map
- distromatic
- disturb
- disturbance
- disturbance of soil
- disturbance vector
- disturbed ice
- disturbed roof
- disturbing force
- disturbing mass
- disturbing masses
- disulfide
- ditch
- ditch board
- ditch cut