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Catchment forestry in Tanzania : status and management

1985 Hermansen, John E. | Benedict, Faye | Corneliussen, Tore | Hofsten, Johnny | Venvik, Hans |

Sustainable development : learning for tomorrow's world : international conference on environmental education, Bo, Telemark, Norway, June 8-10 1988 : report

1988 Fjortoft, Ingunn | Halle, Per Kristian |
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