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The layer historically evolved as follows: - The earliest known was Adopted on April 17, 1989 for the New Carrollton Transit District Development Plan and captured on WSSC grid based TDOZ half sheet Mylars at 1:2400 scale. - All overlay layers were captured in GIS together as one Countywide Layer in ArcInfo in 1997 by CENTECH Group Inc. with subsequent amendments incorporated. - In November of 2000 all Overlay layers were stripped out into their own countywide layers due to the complexity of attributing the increasing number of overlapping features due to new overlay layers being implemented. - Data migration 2006-07, to ArcGIS 9.1 geodatabase and a SDE seamless Transit_District_Overlay_Poly layer was created. 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