Meah She’arim [one hundred letters and Ma’amarim from the first three generations of the Chabad dynasty]. Edited by Chaim Eliezer Bichovsky and Chaim Meir Heilman.

Published in honor of the one hundredth yahrtzeit of the Alter Rebbe, R. Shneur Zalman of Liadi. Historically important, providing little known customs enacted during the time of the Alter Rebbe and then changed over the generations. According to Habermann the work was published in two versions, in and of itself, and along with a Siddur.