Brockhaus and Efron Encyclopedic Dictionary
According to the "Brockhaus and Efron Encyclopedic Dictionary", by the beginning of the twentieth century a significant population of Azerbaijanis still lived in Russian Armenia. They numbered about 300,000 persons or 37.5% in Russia's Erivan Governorate (roughly corresponding to most of present-day central Armenia, the Iğdır Province of Turkey, and Azerbaijan's Nakhchivan exclave).