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Personal communications
- Barboza , F L . March 30 1995 . Director of economic planning at the DNPM in Brasilia March 30 ,
- Bettencourt , J S . March 9 1995 . professor at the department of economic geology at the University of Sao Paulo March 9 ,
- Chaves , A P . March 8 1995 . professor at the Department of Minerals at the University of São Paulo March 8 ,
- Goncalves , J M . March 13 1995 . Director of the association of mineral producers (Sindicato Nacional da Industria Extracāo de Estanho (SNIE) March 13 , Rio de Janeiro
- Machado Coelho , H . March 27-29 1995 . Manager of production at Pitinga in the Amazon state March 27-29 ,
- Madhusudanan , N . March 7 1995 . Manager of processing at Paranapanema , March 7 , São Paulo .