GeoLevel4

tblGeoLevel4, shared across files, county or other smaller area. From World Geographical Scheme for Recording Plant Distributions, Plant Taxonomic Database Standards No. 2. Edition 2 and from United States Federal Information Processing Standards Publication 6-4 (http://www.itl.nist.gov/fipspubs/fip6-4.htm) and other sources.

   Level3ID, character, 3 bytes, = tblGeoLevel3.Level3ID
   Level4ID, character, 3 bytes, identifier for fourth level in geographic classification
   Name, text, 50 bytes maximum, name for the region ("county")
   CountryCode, character, 2 bytes, ISO country code of the region