argyropyrite - automatic lock-out
- artificial nourishment
- artificial phase
- artificial rock-thawing
- artificial roof
- artificial source method
- artificial stream
- artificial support
- artificially impounded body
- artinite
- Artinskian
- artiodactyles
- arzrunite
- as already stated
- as assays come in
- as chances occur
- as expected
- as far as
- as noted above
- as of the end of 1996
- as previously thought