The US Interstate Highway System: 40 Year Report

http://www.publicpurpose.com/freeway1.htm

Michigan 120 4,200 0.47 Minnesota 80 2,500 0.63 Mississippi 105 3,500 1.46 Missouri 190 6,400 1.33 Montana 50 1,700 2.27 Nebraska 30 1,100 0.72 Nevada 80 1,600 2.13 New Hampshire

Early broadcast radio stations

http://stephen.shawweb.co.uk/radio02.html

600 miles away, in Minnesota, reported that WGY's volume exceeded that of his local station, eighty miles away; while Mr. C. C. Hollenback, chairman of the radio committee of stat
A collection of articles from UK Radio magazines 1917-1948 on early radio transmitters

That's everything I could find.
Help make me smarter by submitting a page.