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Federal
EPA 40km Hexagons for Conterminous United States
Department of the Interior —
This dataset of 40 square kilometer (sq. km) hexagons was created by the U.S. EPA's Environmental Monitoring and Assessment Program (EMAP) and is being released by... -
Federal
Data Layers for 2007 Mammal Inventory, NETN and SAHI
Department of the Interior —
This feature classes are randomized grids generated using ArcObjects for ArcGIS version 8.1. The park boundary defines the area for which grid cells were generated....