At 16:48 8/27/97 CDT, you wrote:
|If I know that a person (or address) is subscribed to a list that is
|a Sub-List of a master list, how do I find out which specific list
|that person is on?

There's nothing magical about finding a person on a sub-list vs. a list.
You do it the old fashioned way: either REV or SCAN.