What does Black stand for?

Blackerby's Magistrates' Reports - 1327-1716 - England - A publication (DLA)

Blackford's Indiana Reports - 1817-47 - A publication (DLA)

Black's Reports - 30-53 Indiana - A publication (DLA)

Black's United States Supreme Court Reports - 66-67 United States Reports - A publication (DLA)

Blackwell, OK - American Association of Railroads railroad junction routing code