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From page 2...
... 2 are looking at special subpopulations (e.g., members of ethnic groups, people of certain ancestries, group quarters residents, bicycle commuters) that can be separated using the PUMS data.
From page 3...
... 3 tion. The transportation planning community may benefit from discussions of PUMS data quality issues and benefits in our two-way dialogue with the Census Bureau staff.

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