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Dissolve button: Merges adjacent polygons which have the same value for one or more specified fields.

Notes:

Example:

Before Dissolve - 4 polygons After Dissolve with ET - 3 Polygons Results from GeoProcessing Wizard - 2 Polygons (1 multipart)
dis1.jpg (4792 bytes) dis2.jpg (4597 bytes) dis3.jpg (5024 bytes)