The Avner Institute presents the Rebbe's letters of gratitude, written during the yahrzeit (10 Shevat) of the Rebbe Rayatz, to two gentlemen on their success in returning part of his father-in-law’s holy books to their rightful place, the Library at 770 Eastern Parkway; and of gratitude for the holy memory and impact of his father-in-law—referred to here as the Ba’al Hahilulo—on Jews of all ages and backgrounds.