通牒及照会（紀元二千六百年 令旨奉戴二十週年 奉祝大日本青年団地方動員大会ニ関スル件） Notification and Inquiries (Regarding the Regional Mobilization Convention of the Dai Nihon Seinendan Celebrating the 2,600th Anniversary of the Founding of Japan and the 20th Anniversary of the Appointment of the Prince as the Leader of the Organization)