 In 1818 appeared the first part of Hammarsköld's chief contribution to literature, his famous "Svenska Vitterheten", a history of polite letters in Sweden, a book that was revised and republished after his death by Sondén, in 1833.Hammarsköld was among the first to recognise the talent of the poet Erik Johan Stagnelius.He collected the works of the deceased poet and published his poems in 1824-26.