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From page 143...
... we want to distinguish the most urban from the less urban Do counties? The original ERS version distinguished central from outlying counties, for metropolitan areas of 1 million or more residents (1M+)
From page 144...
... Past decisions regarding population thresholds and related criteria were made with little or no supporting research, e.g., the 2,500 urban threshold, the 50,000 metro threshold, the 500 people per square mile rural-urban boundary, the 25 percent commuting metro-nonmetro boundary.
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