Memorandum from graduates of Betar Naval School in Civitavecchia and graduates of Betar recruiting units regarding establishment of seamen group (May 1939). Group goals and plan of action. Memo from Yermiyahu Halperin on creating itinerant naval Eretz Israel exhibition (17/11/1946). Another memo from Yermiyahu Halperin regarding the exhibition (28/04/1947).