I had two sets of these, New Standard Encyclopedia, from the same year (1931).
Sold the green editions; red ones are left.
Much smaller in size than the Funk and Wagnall's our family got, one book at a time, free with a certain amount of groceries purchased, in the 1950s.
Complete set, in good usable condition.
Don't think there are any pages missing, or damage to the pages.
The spines show had some fading, but I believe you can still read what's there.
I make frequent trips to the Des Moines area and can meet with a buyer in some convenient location for the sale.
If you're interested in old books, especially sets of books, watch for my future listing where I'm going to have a couple of pallets of them for sale for a very reasonable price.
I no longer have a house big enough to devote a whole room to a library.