Perhaps you should try some spelling variations:
"bibliotheca duboisiana" » "bibliotheca parisiana", "bibliotheca banksiana", "bibliotheca bodleiana"
"biblioteca americana" » "bibliotheca americana", "biblioteca ambrosiana", "biblia americana"
"biblioteca medicea" » "bibliothecae mediceae", "bibliotheca meadiana", "bibliotheca indica"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("biblioteca medicea") OR ((("biblioteca americana") OR ("bibliotheca duboisiana")))).
• Removing quotes may allow a broader search: (( biblioteca medicea ) or ((( biblioteca americana ) or ( bibliotheca duboisiana )))).
• Adding a wildcard symbol may retrieve word variants: (("biblioteca medicea") or ((("biblioteca americana") or ("bibliotheca duboisiana"))))*.