The USGS publishes a geological map that reveals the underground layers of the U.S. and supports environmental education and ...

It just got way, way easier to search and browse the US Geological Survey’s collection of historical topographic maps, thanks to a new online map viewer. These maps—more than 178,000 of them—date back ...

Heading outdoors with a map doesn’t just help to keep you safe – it can help you discover natural features you might otherwise have overlooked or choose the best route to a summit according to your ...