A Rabbeinu Tam Bochur

 

Here is a letter signed in the name of the Frierdike Rebbe to Rabbi Yehuda Leib Posner from 4th Kislev 5707 describing what it means to wear Rabbeinu Tam tefillin.

12 Nissan 5707

Here is a letter from R' Shmuel Zalmanov to rabbonim on behalf of Vaad Shomrei Shabbos encouraging them to speak about shmiras shabbos in their shuls and to establish shiurim in hilchos shabbos.