Number 40 , the Little Golden Book Of Singing Games has a value of 15.00. this would be an "A" edition in great condition. You are correct in identifying your book as a fourth edition so that value would be lower. When the book is not in very good condition the value drops a lot.
I have found "Singing Games" (42 pages) which was originally published in 1947. The letter D is on the inside back cover, which makes me think it's a fourth edition. I would say the condition is from fair to poor. There are no pages missing or torn, but the cover and binding have taken a beating. Any advice anyone has on the value would be welcome. This is my first purchase of a pre-1970 LGB so I'm not sure I'm ready to invest in the guide yet. Thanks in advance. Chris McL.