Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
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A lock (
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information only on official, secure websites.
Ratio of four types of green space to total county area, by county. a developed open space. b forest. c shrub and scrub. d grassland and herbaceous. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
