| Code |
Description |
| A |
Airline measurement. |
| B |
Analog or graphic recorder. |
| C |
Calibrated airline measurement. |
| D |
Differential Global Positioning System. |
| F |
Transducer. |
| G |
Pressure-gage measurement. |
| H |
Calibrated pressure-gage measurement. |
| L |
Interpreted from geophysical logs. |
| M |
Manometer measurement. |
| N |
Nonrecording gage. |
| O |
Observed. |
| P |
Acoustic Pulse measurement. |
| R |
Reported, method not known. |
| S |
Steel-tape measurement. |
| T |
Electric-tape measurement. |
| V |
Calibrated electric-tape measurement. |
| W |
Calibrated electric cable. |
| X |
Uncalibrated electric cable. |
| Z |
Other. |
