I was born in the late 1960’s. There was a children’s book that had to have been published before 1973 that I remember that had these illustrations it in about either a mole, a rabbit or a mouse whose family lived underground. The book had illustrated cut-aways that showed the ground above, the tunnels going down and their little house down in the earth (like a little kitchen, bed, etc.). For years it has been driving me nuts trying to find this book. So if you have any information please let me know.