Five bound volumes containing letters of Aleksandr Semenovich Kovalevskiĭ to his wife; to his eldest son, Mikhail; and letters by his children and by other persons. Most of the letters are from 1845-1846 and 1853-1860, many being from the time of his military service in the Crimean War. There are also a few items from the mid-1820s (a letter to A. S. Kovalevskiĭ, a few class notes). Four of the volumes are stamped"Perepiska moego ottsa s mamashei︠u︡..", the fifth "Pisḿa s 1855-1860 g." The volumes were bound by Mikhail Kovalevskiĭ.