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  • Number of employees, transport equipment industries, 1967
  • Drainage
  • Population density, 1960, number of persons per square mile
  • Counties, 1816
  • Major urban areas, 1960
  • Counties and townships
  • Settlements with a population of 1,000-25,000, 1960
  • Population distribution, 1860
  • Number of employees, rubber and plastic products industries, 1967
  • Oats acreage, 1964