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National statistical tables report
(2003)
Pilte rahvaloendusest
Tõnurist, Anu, (2013)
Migration and economic activity
(1978)
Concepts and methodology adopted in the Census of Manufacturing Industries 1963
Solomon, Devadason, (1966)
Labour conditions and discrimination in Southern Rhodesia (Zimbabwe)
Clarke, Duncan G., (1978)
Small-scale manufacture of stabilised soil blocks
(1987)