Jaan Kaplinski was one of the authors and initiators of the so-called Letter of 40 intellectuals (Neljakümne kiri) action.
The Scarlet Letter | Dear John letter | White-letter Hairstreak | Letter-winged Kite | Letter of Majesty | National Letter of Intent | letter | National Association of Letter Carriers | Chi (letter) | Beta (letter) | Barons' Letter, 1301 | The Johns Hopkins News-Letter | Strawberry Letter 23 | My Letter to George | Moe Letter Blues | Loudermill letter | letter (message) | Letter from an Unknown Woman | Letter bomb | Hazing in Greek letter organizations | Habbush letter | Einstein–Szilárd letter | Delta (letter) | Dead Letter Circus | Chrysler 300 letter series | Canuck letter | American Letter Mail Company | Alpha (letter) | 1971 killing of Bengali intellectuals | Zinoviev letter |