Various Ethnographic Maps of the Balkans
Presenting the Slavs of Macedonia as Bulgarians
Lejean - FrenchMap of A. Boue, French (1840)
A traveler and scholar who edited in 1840 his cornerstone piece "La Turquie d'Europe" . He traced almost precisely the borderlines separating the different races in Macedonia.
Lejean - FrenchMap of T.Safarik, Czech (1842)
The famous Slavicist provides valuable data concerning the territories inhabited by Bulgarians on the Balkans and, particularly, in Macedonia.
Lejean - FrenchMap of G. Lejean, French (1861)
Lejean was sent in a journey to the Ottoman Empire to gather information for the French government. His observances of the ethnic composition of the areas he visited produced this map.
Mackenzie - BritishMap of G. M. Mackenzie and A.P. Irby, British (1867)
The two ladies, Mackenzie and Irby, traveled through the Balkans to explore the ethnography of the peninsula. 
Kiepert - GermanMap of H. Kiepert, German (1876)
Kiepert was a professor at the University of Berlin. He had knowledge of Balkan history. He also inquired in official sources in Istanbul and was influenced by the Greek historian P. Aravantinos (1856-7).
Sax - AustrianMap of K. Sax, Austrian (1878)
Karl Sax was a consul of the Austria-Hungary Empire at Adrianople. He was well acquainted with Balkan affairs and had cultivated an intellectual interest in cartography. He made use of previous maps and official reports of populations by Austrian and Bulgarian offices.
German Foreign OfficeMap by the German Foreign Office (1940)
This highly detailed map was produced by the Geographical Division of the German Foreign Office and it was based on local official information.
British P.C.G.N.British P.C.G.N. (1942)
The Permanent Committee on Geographical Names for British Official Use produced this map in 1942. The method used was a simple shading of linguistic zones.

These maps, except the German Foreign Office map, were taken from the book Maps and Politics, A Review of the Ethnographic Cartography of Macedonia by H. R. Wilkinson, published by University Press, Liverpool, in 1951.