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Legend (DW_Map_Dynamic/EN_Map_Indexes_WTM_Ext)

250K USGS Quad Index - Level 0 - 3 (2)
250K USGS Quad Index - Level 4 - 16 (3)
100K USGS Quad Index - Level 1 - 2 (5)
100K USGS Quad Index - Level 3 (6)
100K USGS Quad Index - Level 4 - 16 (7)
24K USGS Quad Index - Level 3 - 4 (9)
24K USGS Quad Index - Level 5 - 6 (10)
24K USGS Quad Index - Level 7 - 16 (11)
12K USGS Quad Index - Level 4 - 5 (13)
12K USGS Quad Index - Level 7 - 16 (14)