1978-07-25: Central Bank of Bolivia, 50th Anniv.

1978-06-01: Bolivarian Games,8th Ed.

1978-06-01: Stamp Exhibitions

1978-06-01: Definitives of 1978

1978-06-01: Andean Health Ministers Meeting, 5th Ed.

1978-06-01: World Rheumatism Year

1978-06-01: 75 years of the Nobel Prize award ceremony (1976)

1978-06-01: Football World Cup 1978, Argentina

1978-06-01: 25th Anniversary of the Coronation of Queen Elizabeth II

1978-06-01: Charles Lindbergh; Zeppelin letter

1978-05-02: Comptroller General, 50th Anniv.