Last seen in:
- Newsday.com - May 13 2021
- L.A. Times Daily - Jul 22 2018
- The Washington Post - Jul 22 2018
- Newsday.com - Feb 16 2018
- Newsday.com - May 22 2016
- Newsday.com - Jan 26 2014
- Newsday.com - Oct 15 2009
- USA Today - Mar 25 2009
- The Telegraph - QUICK CROSSWORD NO: 25,189 - Jan 1 2007
- L.A. Times Daily - Aug 27 2006
Related Clues:
- Painting's deeply boring
- Instruction to mechanic might be a bore
- Eliminate all friction from fuel source
- Base of rig — lubricate generously
- Shaft to extract fuel
- Boring - source of petroleum
- Source of fuel
- Whence petroleum is extracted
- Source of 'black gold'
- Borehole for petroleum
- Shaft found under a nodding donkey
- Source of crude
- Sedimentary clay rock, which may contain oil
- Source of black gold
- Source of petroleum