Value of Antique 1901 Encyclopedia Britannica?

I have a full set of encyclopedias of 1901 printing and was wondering of what it is worth. It's a New Warner Edition, Encyclopedia Britannica, Vol.XXII, in thirty volumes with New American Supplement. It was edited by Day Otis Kellogg DD. I got this info from a few books I keep out for display. Others are stored so I'm hoping it's a complete set. They will be for sale.