I’ve looked all over NYC for my favourite children’s book to no avail. It contained stories with elves as well as several more modern city stories. It had black and white illustrations , probably pen and ink. The book was in memory slightly  smaller than 8 ½ by 11 in two dimensions and over an inch thick. It had a pearl grey hard cover that was pretty shiny in the 1950’s. That’s all I remember and it’s not much to go on, but I’d love to find a copy.