Letters to the North (Thư ra Bắc) is a collection of handwritten letters and envelopes sent by wartime correspondent Phạm Nghĩa to his wife, Nguyễn Thị Loan, who worked at the Vietnam News Agency (Thông tấn xã Việt Nam). The envelopes, marked “Thư ra Bắc” (Letters to the North), bear no postage stamps, reflecting the distinctive circumstances of correspondence during wartime. The collection includes handwritten letters on aging paper, accompanied by their original envelopes addressed to Nguyễn Thị Loan at 5 Lý Thường Kiệt Street, Hanoi. The envelopes bear handwritten markings and identification codes, while the letters offer a personal glimpse into the experiences, emotions, and relationships of individuals separated by war. Beyond their significance as intimate exchanges between husband and wife, these documents provide valuable insights into the personal lives of Vietnamese wartime journalists and their families. The collection illustrates how correspondence helped sustain emotional connections across geographical distances and the disruptions of war. As primary historical sources, these letters contribute to the documentation of Vietnam's wartime history, particularly the experiences of journalists working in conflict zones. Their preservation offers researchers an opportunity to explore the intersections of journalism, family life, personal memory, and the social history of war.