On Thu, 10 Jul 2003 23:06:33 GMT, Thomas Billings
wrote:

This correlates strongly with the difference between the calculated
largest size for lunar lavatubes, based soley on gravity differences
(about 385 meters in diameter, by Horz, 1988, in ' Lunar Bases and Space
Actvities of the 21st Century') and the search of lunar photo
observations by Coombs and Hawke, which indicated at least one tube of
1050 meters diameter, and several kilometers in length, with many larger
than 385 meters diameter.

Well that answers part of my question, how conclusive is this data ?
Sounds like an interesting place to send a rover. Do you have any
links that list coordinates? ISTR, from ancient cobwebs that there
were a few suspected tubes near or in the northern polar region.