firewall - fluoroscope
- first slice
- first water
- first weight
- first working
- first workings
- first-aid
- first-arrival curve
- first-arrival muting
- first-arrival traveltime
- first-break arrivals
- first-break data
- first-break energy
- first-break information
- first-break interpretation
- first-break region
- first-break statics
- first-derivative map
- first-mining
- first-order approximation
- first-year ridge