LVA has told me that some of these are in their collection, in various forms. Probably not complete, but there is a substantial collection from Fauquier Co and some of the neighbors (not as much for Frederick Co). Those interested should contact the archives research services and ask about the "LIST OF VIRGINIA TITHABLES, RENT ROLLS AND POLLS". Also this URL is another brief source of background info. on the taxation system in the colony: http://www.lva.lib.va.us/whatwehave/local/va20_coltax.htm I haven't gotten to all the mail on this topic but thanks to everyone who responded (& in advance to those who come up with more leads :^)