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I personally use several WMS layers (Web Map Service) in GIS software. Many are free to use, some are licenced. Here's a short list that might interest you: CalTopo: has USGS and NRCan scanned to...
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I personally use several WMS layers (Web Map Service) in GIS software. Many are free to use, some are licenced. Here's a short list that might interest you: CalTopo: has USGS and NRCan scanned to...