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- [22] FEDERAL-STATE COOPERATION IN WATER POLLUTION CONTROL CIVIL ENGINEERING, 1971, 41 (05): : 43 - &
- [25] INDUSTRIAL STATISTICS OF THE FEDERAL-REPUBLIC-OF-GERMAN - GERMAN - WERNER,K WELTWIRTSCHAFTLICHES ARCHIV-REVIEW OF WORLD ECONOMICS, 1960, 84 (02): : 98 - 99