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| 1 | 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) |  | ||
| 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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