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Transport i svjaz' : statističeskij sbornik
(1991)
Razvitie sredstv svjazi v Tadžikistane
Kabirov, Chamid, (1965)
The economics of intercommunications in the USSR : the postal service and telephone and telegraph systems
Lewis, John Patrick, (1974)
Geografija svjazi, sostavnaja čast' ėkonomičeskoj geografii
Podgorodeckij, I. A., (1963)
Problemy dal'nejšego razvitija svjazi v SSSR
Podgorodeckij, I. A., (1960)