title: Free but not equal.
authors.affiliation: School of Medicine, The Johns Hopkins University, Baltimore, MD, USA.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Semba
mesh_terms: D001741:Black or African American / Q000266:history; D047831:American Civil War; D004032:Diet / Q000266:history*; D054624:Health Status Disparities; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008404:Massachusetts; D008887:Military Medicine / Q000266:history*; D009755:Night Blindness / Q000453:epidemiology / Q000208:ethnology / Q000266:history*; D014481:United States; D044465:White People / Q000266:history