Nothing
#AAA
cache_options = new.env()
cache_options$usetemp = FALSE
nhd_proj = '+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs'
nhd_projected_proj = "+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 +y_0=0 +datum=NAD83 +units=m +no_defs"
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