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1991 The 150th Anniversary of the Birth of Doctor Manuel Ferraz de Campos Salles, and the 150th Anniversary of the Birth of Doctor Prudente de Moraes

1991 The 100th Anniversary of the Bureau of Agriculture and Provision, Sao Paulo

1991 The 100th Anniversary of the Birth of Lasar Segall, 1891-1957

1991 National Stamp Exhibition “Brapex 91” – Vitoria, Espírito Santo, Brazil – Hummingbirds and Orchids in Mata Atlantica Forest

1991 National Stamp Exhibition “Brapex 91” – Vitoria, Espírito Santo, Brazil – Hummingbirds and Orchids in Mata Atlantica Forest

1991 America – Voyages of Discovery

1991 International Telecommunications Exhibition “Telecom 91” – Geneva

1991 The 100th Anniversary of the 1891 Constitution

1991 Papal Visit and the 12th Anniversary of the National Eucharistic Congress, Natal

1991 Birth Anniversaries of Writers