The issues of Virginia County Records were called Volumes. Different issues/volumes contained different kinds of records. Volume 4 was Marriages Pt 1. Volume 5 was arms-bearing gentry, and so on. Presumably there was a plan to do more marriages later. Liz's link is Volume 4.
(Actually some of the Volumes were issued in 4 quarterly parts to be bound together, so there are tables of contents in the middle, but Volume 4 seems to be all in one piece)