Value of 1914 The Century Dictionary?

I have a corduroy covered "The Century Dictionary: An Encyclopedic Lexicon of the English Language." It is in good condition for its age with some light staining on the corduroy, yellowing of pages, and a few loose pages. It weighs almost 30 lbs! I would like to know a reasonable amount to ask, as I have seen it on Antiques Roadshow and know I cannot ask that amount. Thanks!

By CJ