Value of The Encyclopedia Americana 1951?

Could anyone tell me what this set is worth?

I have a complete set of 30 volumes and in very nice condition of 'The Encyclopedia Americana' 1951 edition. These are all hardbound; complete from A to Z.

The editors are: A.H. McDonald, B.L. Editor in Chief (Emeritus)
LAVINIA P. DUDLEY, Litt. D., Executive Editor of Americana Publications
ROBERT C. WALLACE, Ph.D., D.S. c., L.L.D., Editor for Cananda

By Bookworm Mary