The renowned collection of halachic questions and answers from one of the greatest authorities of our time! This monumental nine-volume set contains the collected letters of Rav Moshe Feinstein, zt"l, one of the greatest and most well-respected halachic authorities of the 20th century. These letters offered detailed responses to questions of halacha (Jewish law) that he had been asked. Studied by Jews around the world, these "responsa" letters (as they are known) offer a glimpse into the deep understanding of a master of Jewish law, Talmud and Tanach. This set is an essential work for any serious Torah student.