The article analyzes the handwritten “Catalog of New Library Acquisitions” by the famous bibliographer and bibliophile D.V. Ulyaninsky (1861—1918), stored in the department of Rare books (the Book Museum) of the Russian State Library. It is considered as an ego-text that directly reflects the bibliophile life of the author and his experiences related to it. In the text, the bibliophile not only recorded all receipts to his personal library, but also left diary entries. From them, you can learn about the folding of the library structure, changes in the accounting system, and the exclusion of publications from its composition. In his diary entries, which became acts of self-communication and self-reflection, the bibliophile described his relationship with booksellers, difficulties in collecting, justified for himself the high costs of books, rejoiced at successful acquisitions, noted some events of public and personal life, etc. It is concluded that the “Catalog of New Library Acquisitions” acted as a draft, a pre-text for a detailed bibliographic description of the library of D.V. Ulyaninsky, which received a printed embodiment. Many of his notes remain only in manuscript. This fact makes them a unique source both for studying the biography of D.V. Ulyaninsky and for the history of the world of antique book trade and bibliophilia of the late 19th — early 20th century.