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Layers—ArcGIS Pro | Documentation - Esri
A quick tour of map layers—ArcMap | Documentation - Esri
Layers—ArcGIS Online Help | Documentation
The 5 Layers of GIS Mapping: What They Are and How They Work
WHAT IS GIS? Geographic Information System (GIS) - Esri
Add layers to a map or scene—ArcGIS Pro | Documentation - Esri
What is a layer?—ArcMap | Documentation - Esri
Browse layers—ArcGIS Online Help | Documentation
Explore layers and data | Learn ArcGIS