Maclure & Macdonald (Firm). "The Graphic map of Bulgaria, eastern Roumelia, the Turkish Empire in Europe, etc., according to the Treaty of Berlin." Map. London: Maclure & Macdonald, 1885. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:4m90fn94r (accessed April 17, 2024).