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18 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 Introdution | Vegetation Layer | Vertebrate Layer Land Management Layer | Products & Applications |
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The National GAP standard for distributional units is the EMAP hexagonal grid created by the EPA. The use of this system has many benefits including uniform national coverage which will facilitate the joining of multiple state data bases.