There is a book--"Brunswick County, Virginia, 1720-1975" by Gay Weeks Neale. This is a modern history book (1975) with footnotes and bibliographies and great appendices. It has a good index. This book deals mostly with the later, smaller Brunswick, that wound up east of Bedford. Particularly around the Meherrin River. But it has some goodies on very early families in that portion of Brunswick that became Bedford, Campbell, and Halifax. You may find it at a library or Amazon. If you "google" the title, under google books, they will give you a list of libraries that have it. There is a lot of info about the Stith family, and their kin. It lists the very early justices and clerks and sheriffs and surveyors. Militia lists, war rosters, land grants, etc. Many, many families are mentioned. It is worth a look. Sadly, my Irvines are not there. Edwin