I'm trying to find a published source giving the percent of U.S. households having electricity and percent having telephones in 1940 (+/- a year or two). Not interested in the rural vs city divide per se, but, rather, the aggregate stats.
The numbers don't need to be super accurate either -- I'm happy to read off of a graph.
I've poked around the internet, and, to my surprise, couldn't find these stats very easily. I also have Julie Cohn "The Grid", but the numbers (for electrification) are not readily found there either.