This is titled The Little Golden Book Library. It has 4 books of 384 pages in a sleeve to hold them. The books are Our Wonderful World;Fairy Tales and Rhymes; Golden Favorites;Bedtime Stories. Each is a different color with a golden spine. A 2006 guidebook values it at 80.00 in mint shape.It was released in 1972.Different sets of these are available for sale on ebay.com
I searching for a 4 volume set of Golden Books from my childhood. Each book was fairly thick (like a text book) and each was a different color and theme - pink was Fairy Tales, Blue as Animal Stories, etc.
My mother recalls buying them around 1974 and thinks they may have been through a company like Reader's Digest, but isn't sure about that.
Any help finding them or finding a title would be much appreciated!