Biblioteca Nazionale Centrale di Firenze: theses from the mid-80's are searchable. Add the word dottorato to your search terms.

Helveticat. The Swiss National Library has a copy of all dissertations written in the country. Add the word “diss” to your search terms in order to retrieve dissertations.

EthOs: British Library dissertations

As a last resort, you can purchase dissertations directly.

Dissertation Express : US, from ProQuest

• Verify using the tools listed above that the document is not otherwise available to you free before ordering.
• If Interlibrary Loan can't locate a copy to borrow.
• Use a credit card or fax payment.
• Orders are shipped directly to you.

• Guidelines at JHU
• Formatting requirements

• Catalogues in the library collections will usually treat a particular subject, time period, or institution.
• You can locate printed catalogues of dissertations easily in the online catalog. 
• Or in WorldCat.
• For either database, do a Subject Keyword search on:  Dissertations Italy bibliography.