https://search.yahoo.com/yhs/search?p=rare+records+price+guide&ei=UTF-8&hspart=mozilla&hsimp=yhs-003

You can find what you need on this page !! The rarerecordspriceguide, will help on the 78`s !! I have had a ton of these and most are hard to even give away !! I still have quite a few for my Victrola !! Even if they give a value,, if no one wants it,, its a bust !!
There are a few than can bring decent money but they are few and far between !!