The Myldred Masson Costa papers include correspondence, meeting minutes, promotional material, and other documents related to her activities on a variety of official boards and neighborhood associations dedicated to historic preservation in the French Quarter from the 1970s and early 1980s. These organizations include the French Quarter Task Force, the Vieux Carré Association, the Louisiana Council for the Vieux Carré, and the Louisiana American Revolution Bicentennial Commission. Additionally, the collection includes documents related to Costa’s work with Le Petit Theatre du Vieux Carré, as well as in French societies, such as the Council for the Development of French in Louisiana (CODOFIL), Athénée Louisianais, and L'Heure Françhaise. The collection also includes some personal correspondence, newspaper clippings, as well as scrapbook pages from a One Act Play Tournament from the 1930s.