I Portuguese
Portuguese language and literature
| I* | Dictionaries and reference | |
| I1 | Study of Portuguese language and phonetics | |
| I2 | Portuguese dialects | |
| I3 | Old Portuguese : grammars and composition | |
| I4 | Modern Portuguese : grammars and composition | |
| I8 | Anthologies : general collections | |
| I8.1 | Anthologies : poetry | |
| I8.2 | Anthologies : drama | |
| I8.3 | Anthologies : prose | |
| I9 | History of literature and literary criticism | |
| I10 | History of drama. Theatre |
Authors : Texts, criticisms, biographies
| I11 | Portuguese authors who flourished up to and including 1199 | |
| I12 | Authors who flourished between 1200-1299 | |
| I13 | Authors who flourished between 1300-1399 | |
| I14 | Authors who flourished between 1400-1499 | |
| I15 | Authors who flourished between 1500-1599 | |
| I16 | Authors who flourished between 1600-1699 | |
| I17 | Authors who flourished between 1700-1799 | |
| I18 | Authors who flourished between 1800-1899 | |
| I19 | Authors who flourished between 1900-1999 | |
| I20 | Authors who flourished between 2000-2099 |