highly-faceted searching

[graybeal]

Is your feature request related to a problem? If so please describe.
Users want to be able to select datasets quickly based on various facets that describe them.

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Per Mathew: something similar to IPUMS interface to show where it comes from and year available

• be great to combine that with the census geospatial

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Additional context
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[Dec 10 2020 interview with PHS researchers]