• Letter to the the Bishops of the Malankara Catholic Church (December 1, 1980)
  [English, Italian, Portuguese, Spanish]

• Letter on the occasion of the publication of the German extraordinary edition of L'Osservatore Romano (November 1, 1980)
  [Spanish]

• Letter to the Bishops of Guatemala (November 1, 1980)
  [Spanish]

• Letter to Cardinal Parente on the 25th anniversary of Episcopal Ordination (October 22, 1980) 
  [Italian, Latin]

• Letter to the Bishops of El Salvador (October 20, 1980)
  [Spanish]

• Letter to the Church of Hungary on the millennium of the birth of St Gerard (September 24, 1980)
  [Italian, Portuguese, Spanish]

• Message to the Bishop and faithful of Massa Marittima (September 6, 1980)
  [Italian, Portuguese, Spanish]

• Letter, signed by Card. Casaroli, to H.E. Msgr. Carlo Manziana on the occasion of the 31st Italian National Liturgical Week (August 25-29, 1980)
  [Spanish]

• Letter to the Cardinal Primate of Poland (August 20, 1980)
  [Italian, Polish, Spanish]

• Letter to the Bishops, priests and faithful on the occasion of the 6th Synod (August 15, 1980)
  [Italian, Latin, Portuguese, Spanish]
   
• Letter to H.Em. Michele Tucci, Superior General of the Ordine dei Chierici Regolari (August 7, 1980)
  [Italian, Latin, Portuguese, Spanish]

• Letter to Cardinal Bertoli on the 50th anniversary of priesthood (August 4, 1980)
  [Italian, Latin]

• Letter to Cardinal Flahiff on the 50th anniversary of priesthood (July 21, 1980)
  [Italian, Latin]

• Letter to the Latin American Bishops on the occasion of the Latin American Day of Ecclesial Solidarity
  [Spanish]

• Letter to Cardinal Freeman on the 50th anniversary of priesthood (June 23, 1980)
  [Italian, Latin]
   
• To the Brazilian readers of Osservatore Romano before the Apostolic Journey to Brazil (June 18, 1980)[Portuguese, Spanish]

• Letter to Cardinal Civardi on the 50th anniversary of priesthood (June 16, 1980)
  [Italian, Latin]

• Letter to Cardinal François Marty, Archbishop of Paris (June 3, 1980)
  [Latin]

• Letter to Cardinal Höffner for the 7th International Congress of Sacred Music (May 25, 1980)
  [Italian, Latin, Portuguese, Spanish]

• Letter to H.Em. Jan Pasztor (May 24, 1980)
  [Latin]

• Letter to Father Bernardino Farnetani (May 22, 1980)
  [Italian, Portuguese, Spanish]

• Letter to the Episcopal Conference of Germany (May 15, 1980)
  [French, German, Italian, Portuguese, Spanish]

• Letter to the Brothers of the Christian Schools (May 13, 1980)
  [French, Italian, Portuguese, Spanish]

• Letter to Cardinal Satowaki on the 25th anniversary of Episcopal Ordination (April 12, 1980)
  [Italian, Latin]

• Letter to the Hungarian Church (April 6, 1980)
  [Italian, Portuguese, Spanish]
   
• Message on the occasion of the first edition of  L'Osservatore Romano in Polish (April 6, 1980)
  [Portuguese, Spanish]

• Letter to Antoine Pierre Khoraiche, Patriarch of Antioch (March 28, 1980) 
  [French, Italian, Portuguese, Spanish]

• Letter to Monsignor Angelo Acerbi (March 24, 1980)
  [Italian, Portuguese, Spanish]

• Letter to Cardinal Paupini on the 50th anniversary of priesthood (March 4, 1980)
  [Italian, Latin]

• Letter of notification to attend the Extraordinary Synod of the Ukrainian Bishops (March 1, 1980)
  [Latin]

• Dominicae Cenae (February 24, 1980)
  [English, French, Italian, Latin, Portuguese, Spanish]

• Letter to the Diocese of Rome for Lent (February 22, 1980)
  [French, Italian, Portuguese, Spanish]

• Letter to the Dutch Catholics (January 6, 1980)
  [French, German, Italian, Portuguese, Spanish]

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