Historic New Orleans Collection (HNOC)The major research fields are colonial Louisiana, the Louisiana Purchase, the Battle of New Orleans, the Civil War, Mississippi River life, cartography, transportation, plantations, urban development, Louisiana artists and writers, architecture, the French Quarter, jazz and other forms of early New Orleans music, historic preservation, and Mardi Gras. The collections reflect aspects of the history and culture of the Gulf South, Louisiana, and New Orleans.