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| 1 | OECD environmental data = Données OCDE sur l´environnement : compendium 1991 / Organisation for Economic Co-Operation and Development = Organisation de Coopération et de Développement Économiques . — Paris : OCDE = OECD, [1991]. — 337 p. : tab. ; 27 cm. — | |||
| 2 | The environment in Europe and North-America : annotated statistics 1992 / [Economic Commission for Europe] . — New York : United Nations, 1992. — 366 p. : il., gráf., tab. ; 30 cm. — ( Statistical standars and studies ; 42) |  |
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