 In 1862, with financial support from Valerian Kalinka, Akelaitis wrote his largest work, the Polish-language "Opisanie Wielkiego Księstwa Litewskiego" (Description of the Grand Duchy of Lithuania) or "Litwa pod rządem Rossyjskim" (Lithuania under the Russian Rule).The manuscript, preserved at the Polish Library in Paris, was first described by Paulius Galaunė in 1924 and remains unpublished.It is an unfinished 387-page study on the Lithuania, its territory, inhabitants, economy, religion, education, administration under the Russian Empire.