To find print dictionaries in the library, the easiest way is to look under the call numbers in the following chart. The best and/or most recent dictionaries are usually in the Powell Library Main Reading Room and the Research Library Reference Reading Room. Older dictionaries (which can be checked out) are shelved in those libraries' book stacks with the regular books.
For languages not on the list, search the UCLA Library Catalog for "[language] dictionaries" as a Subject List. For dictionaries that translate into English use "[language] english dictionaries."