Topographic

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Currently, some Forest Service units have elected not to participate in the USGS distribution program. The USGS hopes to carry all Forest Service maps in the future.  
Yes. On average, the Forest Service updates its maps every 2 to 7 years. For some maps where little change occurs, revision may not be scheduled for many years. 
USGS does not currently offer vector downloads in bulk other than by special request only. For assistance, send an e-mail to tnm_help@usgs.gov, and include your contact information, requested product, requested area, and download format.
About 180,000 USGS historical topographic maps (more than 95% of those ever published) are available to the public free of charge, and the number of maps available is still growing. This set of GeoPDF files is referred to as the Historical Topographic...
Instructions for downloading from The National Map Viewer are located in a Download and Cart user guide. Orthoimagery is downloaded with the following steps: Zoom to area of interest. Click on Download Data tool. Draw a bounding box; choose a reference...
Select the Print icon in the upper right-hand corner. You can save and print a map either in PDF, JPEG, or PNG formats. PDF allows the user to include map elements in the header, such as a title and notes. JPEG and PNG only allow the map to be printed.
The Add Data tool in the Advanced toolbar allows you to add an ArcGIS Server (AGS) REST service, Keyhole Markup Language (KML) data file, Really Simple Syndication (RSS), Web Map Service (WMS), or Web Map Tile Service (WMTS) to the map display.  Before...
PLSS data is available in the Content sub-tab under Overlays in a panel called Other Featured Data along the left-hand side of The National Map Viewer. PLSS data layers, such as sections, townships, and ranges, are provided by the Bureau of Land...
The National Map Viewer Quick Start Guide can be found here.