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Fünfzig Jahre Emschergenossenschaft : 1906 - 1956
Ramshorn, Alexander, (1957)
Reducing regulatory barriers to private-sector participation in Latin America's water and sanitation services
Richard, Barbara, (1994)
Ökonomische Probleme der deutschen Wasser- und Abwasserwirtschaft
Brechtel, Johannes, (1960)
Basic industrial markets in the United States
Holleran, O. C., (1936)
The textile industries
The iron and steel industry