Correspondence between Yermiyahu Halperin and Various Individuals, Letter 'Peh' (Hebrew)
Main topics: recruitment for Betar units, fundraising for Betar units, founding Jabotinsky Institute, founding Kupat Holim Leumit (National Health Fund), antisemitism in Poland during World War Two, activities of the Committee for a Jewish Army in London, writing the book "Revival of Jewish Seamanship"