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| 1 | Colloquy on Environment in Europe : Co-operation between Local and Regional Authorities (1991. Siófok, Hungary) Environment in Europe : co-operation between local and regional authorities : working documents and conclusions of the colloquy on environment in Europe : co-operation between local and regional authorities (Siófok, Hungary, 5-6 June 1991) . — Strasbourg : Council of Europe Press, 1992. — 134 p. : gráf., il. ; 29 cm. — ( Studies and texts ; 21) |  |
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