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  • Other proposed electric interurban railroads, 1890-1915
  • Scheduled airline flights
  • Farm land values, 1964, in dollars per acre
  • Wheat acreage, 1964
  • Number of employees, fabricated metal products industries, 1967
  • Physiographic diagram
  • State and national highways
  • Average annual temperature in degrees Fahrenheit
  • Number of employees, primary metal industries, 1967
  • Population density, 1960, number of persons per square mile