| Letters on the Improvement of the Mind, Addressed to a Lady
Mrs. Chapone | |
| Letters on the Moral and Religious State of South America / Written during a residence of nearly seven years in Buenos Aires, Chile, Peru and Colombia
D.D. James Thomson | |
| Letters on the Nicobar islands, their natural productions, and the manners, customs, and superstitions of the natives / with an account of an attempt made by the Church of the / United Brethren, to convert them to Christianity
Johann Gottfried Haensel | |
| Letters That Have Helped Me
William Quan Judge; Julia Wharton Lewis Campbell Ver Planck Keightley | |
| Letters to "The Times" upon War and Neutrality (1881-1920)
Thomas Erskine Holland | |
| Letters to a daughter
Hubert Bland | |
| Letters to a Daughter and A Little Sermon to School Girls
Helen Ekin Starrett | |
| Letters to a Friend, Written to Mrs. Ezra S. Carr, 1866-1879
John Muir | |
| Letters to a Young Housekeeper
Jane Prince | |
| Letters to an Unknown
Prosper Mérimée |
