As part of my research sources, I have an extensive library on a variety of topics.
The page has a dropdown menu from which you may select a topic of your interest and find related dictionaries or books:
Note 1: you will not find school-level dictionaries here. These are highly specialized, expensive volumes.
Note 2: The full URL to my library is https://dl.dropboxusercontent.com/u/6570372/deliciouslibrary/index.html