This Soviet-era economic map of the Yakut Autonomous Soviet Socialist Republic is from an atlas, Yakutia ASSR: Atlas, Socialist Yakutia. It shows six different economic regions in this vast region of Siberia. Depicted on the map are centers for the production of machinery, electricity, and foodstuffs, and for extractive industries producing coal, natural gas, gold, mica, salt, building materials, and diamonds. The development of the mining industry in Yakutia, which started in the 1960s, brought an influx of migrants from European Russia and the other Slavic republics of the Soviet Union, and a change in the ethnic composition of the population. The proportion of Yakuts in the overall population of the republic dropped from 90 percent in 1920 to 43 percent in 1970, 36.6 percent in 1979, and 33.4 percent in 1989. Following the breakup of the Soviet Union, however, the republic experienced a strong outward migration of Slavs and a reversal of these trends. In 1990, Yakutia changed its name to the Republic of Sakha.