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A hierarchical regionalization of RSFSR administrative units using 1966-69 migration data
Slater, Paul B., (1975)
Rsfsr : administrativno-territorialnoe delenie na 1 janvarja 1977 g.
(1977)
Rsfsr. administrativno-territorialnoe delenie na 1 janvarja 1972 goda
(1972)