"A table compiled in early 1948 as the background to a long novel I intended writing about the land I proposed buying in Bucks County. It lay at the southern edge of the terminal moraine and my story would have started with the middle ice age, the Illinoian, and would have dealt especially with the broad valley of the Delaware River. I did a great deal of work on this, much exploring and a good deal of rock work, but it came to nothing. The novel... was fairly well drafted in my mind, but because of Asia I turned to other matters, although the concepts stayed with me permanently."