Children’s Encyclopaedia 10 Volumes (St. Martin's CT3)

Edited by Arthur Mee goodness knows when.
They had been well used by my brothers before I was pouring over them in the late '50s.
I cannot find any ref to when they were published.

Obviously it has been taking space for many years and now really must go. Just asking whether it might be of any historical interest to anyone otherwise I think it will be the tip.