Latest from ESRI Common Issues [RSS]:

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Helpful Articles from ESRI by Topic

.....Coordinate Systems and Projections

• Projection Basics: What the GIS professional needs to know
• No more GCS_Assumed_Geographic_1 for shapefiles
• Identify the spatial reference, projection, or coordinate system of data
• Identify an unknown coordinate system using ArcMap
• Apply a geographic (datum) transformation

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