TY  - RPRT
TI  - Rotary Percussive Auto-Gopher for Deep Drilling and Sampling
AU  - Bar-Cohen, Yoseph
AU  - Badescu, Mircea
AU  - Sherrit, Stewart
PY  - 2009
UR  - https://ntrs.nasa.gov/citations/20090029267
ID  - 20090029267
ER  -