The collection comprises manuscript research notes compiled by Llubera as editor of the 14th-century work, Libro de Los Estados (Book of the States) by Don Juan Manuel. These include biographical notes about Manuel, and editorial notes on the text of the work itself. (MS 634/1).
Other research files include:
- 'Alfonso El Sagio: Cultural background' (MS 634/2);
- 'Arciprest de Hita' (MS 634/3);
- 'Barlaam, Calila, Sendebar' (MS 634/4);
- 'Benjamin of Tudela' (MS 634/5)
- 'Cantar de Mio Cid' (MS 634/6);
- 'Cid [M. Pidal, Espaa del Cid' (MS 634/7);
- 'La Commedia' (MS 634/8);
- 'Cortes Orientals' (MS 634/9);
- 'Cultura Y Arte del Renacimiento' (MS 634/10);
- 'Discipline Clericalis: Conde' (MS 634/11);
- 'Frame Story' (MS 634/12);
- 'History of Spain: The Middle Ages' (MS 634/13);
- 'Islamic Art' (MS 643/14);
- 'Lectures on Arabic Scientific Thought' (MS 643/15);
- 'Maqamat' (MS 634/16);
- 'Medieval Lyric Poetry: Ferno Lopez' (MS 634/17);
- 'Nebrija Prologues' (MS 634/18);
- 'Oriental narrative: exempla' (MS 634/19);
- 'Santob De Carrin' (MS 634/20);
- 'Spanish Architecture' (MS 634/21);
- 'Spanish Medieval Literature (xiith-xiiith century)' (MS 634/22);
- 'Spanish Painting' (MS 634/23); and Traducciones espandes de la Biblia' (MS 634/24);
- loose research notes and poems (MS 634/25-27); manuscript drafts of poems, written in about 1919 (MS 634/28);
- newspaper and journal articles written by Llubera (MS 624/29);
- and printed examination paper for Intermediate Spanish by the Ministry of Education for Northern Ireland, 1924 (MS 634/30).