Letters to a Young Poet by Rainer Maria Rilke
Letters from Rainer Maria Rilke to a young man seeking advice on a literary career. Historic, beautiful, and still useful for aspiring writers today.
Letters to Felice by Franz Kafka
The Letters of Vincent Van Gogh
Letters to Satre by Simone de Beauvoir
Letters to Young Contrarian by Christopher Hitchens
George Orwell: A Life in Letters
Cicero: Selected Letters
A particular highlight is a letter to close friend, Atticus, in which Cicero describes having Julius Ceaser over for dinner at the height of his power. Quite the inconvenience Cicero complains it to have been!
Letters from a Stoic by Seneca
The letters of the Younger Pliny
Letters of Note
I Embrace You with All My Revolutionary Fervor
Faber & Faber: the untold story
A recounting of the story, through letters, of the great publishing house. In it find tails of turning down classics such as Ulysses as well as a couple of Orwell works.
De Profundis by Oscar Wilde
Love Letters: Virginia Woolf and Vita Sackville-West
Letters shared between
Letter from a Birmingham Jail by Martin Luther King Jr.