LInk below

"As a source for genealogists and historians, these registrations, whether in the form of published lists or recorded affidavits, are a valuable source. They contain a variety of data,

including (but not limited to) place of birth, age, occupation, racial composition, physical description, and length of residenc in the area. In the case of the recorded affidavits at

courthouses, white sometimes testified to their knowledge of a certain man, woman, or family's freedom, often provideing clues for associations within the community and origins

for the white affiliant as well as the nonwhite friend. Registrations created before 1850 are especially important as they contain the type of personal information that pre-1850

censuses do not provide on residents of any color." etc