1981 The 50th Anniversary of the Military Institute of Engineering
1981 The 50th Anniversary of the Military Institute of Engineering
Brazil
1981 Day of the Stamp – The 100th Anniversary of Pedro II “Small Head” Stamp
1981 Day of the Stamp – The 100th Anniversary of Pedro II “Small Head” Stamp
1981 The 66th Anniversary of the World Esperanto Congress, Brasilia
1981 The 66th Anniversary of the World Esperanto Congress, Brasilia
1981 The 50th Anniversary of the Madeira-Mamore Railway Nationalization
1981 The 50th Anniversary of the Madeira-Mamore Railway Nationalization
1981 The 50th Anniversary of the National Airmail Service
1981 The 50th Anniversary of the National Airmail Service
1981 The 72nd Anniversary of the International Rotary Convention, Sao Paulo
1981 The 72nd Anniversary of the International Rotary Convention, Sao Paulo
1981 International Museum Day – Artifacts from Brazilian Museums
1981 International Museum Day – Artifacts from Brazilian Museums
1981 The 100th Anniversary of the Birth of Lima Barreto, 1881-1922
1981 The 100th Anniversary of the Birth of Lima Barreto, 1881-1922