Ethnohistory can study the history of what types of groups which may or may not exist today?
Ethnohistory is the study of ethnographic cultures and indigenous customs by examining historical records. It is also the study of the history of various ethnic groups that may or may not exist today. Ethnohistory uses both historical and ethnographic data as its foundation. Its historical methods and materials go beyond the standard use of documents and manuscripts. Practitioners recognize the utility of such source material as maps, music, paintings, photography, folklore, oral tradition, site exploration, archaeological materials, museum collections, enduring customs, language, and place names.
Throughout this article Norman uses "Near East" to mean the countries where "the eastern question" applied; that is, to all of the Balkans. The countries and regions mentioned are Greece, Bulgaria, Serbia, Bosnia-Herzegovina (which was Moslem and needed, in his view, to be suppressed), Macedonia, Montenegro, Albania, Romania. The rest of the Ottoman domain is demoted to just "the east."