PQ4001-5999 Italian literature
- PQ4001-4199.5 History and criticism
- PQ4001-4063 General
- PQ4064-4075 Early to 1500
- PQ4077-4088 Modern
- PQ4091-(4131) Poetry
- PQ4133-4160 Drama
- PQ4161-4185 Prose
- PQ(4186)-(4199) Folk literature
- PQ4199.5 Juvenile literature (General)
- PQ4201-4263 Collections
- PQ4201-4204 General
- PQ4205-4206 Translations
- PQ4207-4225 Poetry
- PQ4227-4245 Drama
- PQ4247-4263 Prose
- PQ4265-4556 Individual authors and works to 1400
- PQ4561-4664 Individual authors, 1400-1700
- PQ4675-4734 Individual authors, 1701-1900
- PQ4800-4851 Individual authors, 1900-1960
- PQ4860-4886 Individual authors, 1961-2000
- PQ4900-4926 Individual authors, 2001-
- PQ5901-5999 Regional, provincial, local, etc.