On geographical investigations of the service sector. (Vestnik Moskovskogo Universiteta geografiya. 1973, 6, S. 3-12)

Kovalev, S. A.1980-01-312020-05-202022-11-262020-05-202022-11-261974https://orlis.difu.de/handle/difu/441965Tertiärer SektorGeographieOn geographical investigations of the service sector. (Vestnik Moskovskogo Universiteta geografiya. 1973, 6, S. 3-12)Zeitschriftenaufsatz017394