1932 Winston's Cumulative Loose-Leaf Encyclopedia's

Set of 10 Volumes of  Winston's Cumulative Loose-Leaf Encyclopedia. The latest copy right inside the cover is dated 1932. They are dark blue in color and have wood spine's with two brass looking brads inside to hold the pages within the book.  On the inside cover page it reads Copyright, 1932, by The John C. Winston Co. Copyright 1912-13-14-15-16-17-18-19-20....through 31. Binder protected under United States Patent Rights of August 27, 1918, June 4, 1907 and Dominion of Canada Pate4nt Rights of June 24, 1919. I don't plan to sell them but just curious as to what a fair market value on this set of encyclopedia's would be today if someone wanted to buy them from me.  Thanks!