{
 "culture": "en-US",
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 "description": "1990 Block Groups from the Michigan Geographic Framework (MGF) base map. Block groups (BG\u2019s) are combinations of census blocks within a census tract or BNA that share the same first digit in their identifying numbers. For example, BG 3 within a particular census tract comprises all blocks numbered between 301 and 399. A census tract or BNA contains a maximum of nine BGs. BG90 consists of the 6 digit tract number followed by the 1 digit block group number.",
 "summary": "",
 "title": "1990 Block Groups",
 "tags": [],
 "type": "",
 "typeKeywords": [],
 "thumbnail": "",
 "url": "",
 "minScale": 0,
 "maxScale": 0,
 "spatialReference": "",
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}