Poetry Notebook(Sổ tay thơ ) is a handwritten collection of poems, personal reflections, and literary excerpts compiled during the Vietnam War. Most of the dated entries are from the latter half of 1968. The notebook contains personal compositions alongside poems copied from other authors, reflecting practices of writing, collecting, and sharing poetry during wartime. The identity of the compiler remains unknown. The full chronological scope of the notebook and the authorship of individual poems require further examination and verification. The notebook explores themes of love, separation, homesickness, friendship, military life, and the anticipation of reunion. Poems such as Sinh nhật Mùa thu (Autumn Birthday), Nhớ Đông (Remembering Đông), and Mấy bài thơ trăng (Moon Poems) express intimate emotions intertwined with wartime experiences. Some verses refer to the Trường Sơn Mountains, military marches, and memories of loved ones. Entries dated between September and December 1968 suggest that the notebook may have served as a means of preserving personal experiences, observations, and emotions through poetry. The notebook also reflects the circulation of poetry within personal networks and military communities during the war. Several poems include attributions to other authors, suggesting that the compiler may have transcribed works encountered through reading, listening, or exchanges with others. This practice offers a glimpse into informal literary culture, in which handwritten notebooks served as a means of preserving and sharing poetry outside formal publishing channels. Physically, the notebook is small and consists of aged, yellowed pages, with most of the text handwritten in blue ink. Ink stains, faded handwriting, corrections, and worn page edges bear traces of its use and preservation over time. As a primary historical and literary source, Sổ tay thơ is valuable for studying wartime poetry, everyday life, personal memory, and the relationship between literature and lived experiences of war. The notebook contributes to the preservation of Vietnam's personal documentary heritage while offering insights into how individuals used poetry to express emotions, maintain personal connections, and record their experiences during the war years.