Wiktionary
open letters
n. (plural of open letter English)
Usage examples of "open letters".
Roch,[7] after many useless refusals, the General Assembly, notwithstanding all the reproaches of its conscience and the resistance of its reason, is obliged to open letters addressed to Monsieur, to the Duke of Orleans, and to the Ministers of War, of Foreign Affairs, and of the Marine.
Learned men from all over Europe actually wrote to the Rosicrucians, and since there was no address, they sent open letters, pamphlets, printed volumes.
Every available surface had open letters and envelopes piled on it.
We had brought his belated correspondence, and a lot of torn envelopes and open letters littered his bed.