| Title | Author | Year | Imprint | Notes |
|---|---|---|---|---|
| The Ulut River of the Province of Samar | Motak, Joseph | 1921 | Samar | |
| Una Carta al Honorable Commisionado Dean C. Worcester Sobre las Malas Condiciones Sociales que Existen en la Provincia de Surigao | 1912 | Manila | ||
| Unisan : Past and Present | De Jesus, Francisco | 1923 | Manila : | |
| Usos y Costumbres de los Igorrotes del Distrito de Lepanto | Bondod, Don Sinforoso | 1901 | Cervantes | |
| Usury in the Northern Provinces of Luzon | Jordan, Espiridion | 1924 | Manila : | |
| The Utilitarian Theory of the Origin of Music | Ambosio, Dominidor B. | 1923 | Manila : |