12th International Soil Conservation Organization Conferenceгруппа конференции
- Конференции:
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Международная Конференция :
12th International Soil Conservation Organization Conference
, Beijing,China, China , 2002
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Международная Конференция :
10th International Soil Conservation Organization Conference. May 23-28,1999,
, Purdue University West Lafayette,Indiana, USA., India , 1999