Here is a very interesting map from 1922, it notes the Macedonians as “Macedonian Slavs”, they have a separate coloring. Also to be noted is that the Bulgarians are Slavo-Mongols according to the Legend of the map.

Title page.

Page 820, Map version 1, lesser quality.

Page 820, Map version 2, higher quality.

Page 820, Map version 2, zoomed.

Source: “The New Larned History: for ready reference reading and research” by J. N. Larned, Volume 1, page 820, published 1922.