I have the book
Uprooted and Transplanted: From Africa to America
Focus on AA in Essex County, VA Oppressions-Achievements-Contributions the 1600's to 1900's

by Lillian H. McGuire (Vantage Press 1999). It includes a transcription of the Free Negro Register for Essex County 1810-1843 and 1843 to 1861. Who are you looking for?

Selma