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Unesco statistical digest : a statistical summary of data on education, science and technology, culture and communication, by country
UNESCO - Paris : Unesco - 4.1984 - 7.1987; 1990; damit Ersch. eingest.
Persistent link: https://www.econbiz.de/10000506281
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Statistique des services postaux
Weltpostverein - Berne - 1964 - 1966; 1967(1969) -
Persistent link: https://www.econbiz.de/10000469024
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Rapport biennal / Union Postale Universelle
Weltpostverein - Berne - 2001/02(2003) - 2009/10
Persistent link: https://www.econbiz.de/10001814263
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Annual report / Universal Postal Union
Weltpostverein - Berne - 2011 -
Persistent link: https://www.econbiz.de/10009622026