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The USGS US Topo Availability service from The National Map (TNM) consists of footprints where US Topo is available in GeoPDF format. Various green tints are used to reflect the year in which latest US Topo map products are published. Information about the latest available US Topo maps can be discovered as well as product downloads from this service through an 'Identify' query. Service content is updated daily to ensure the most current map product is represented. If a user wants to download all current and historical USGS Topo Maps over a given area, these products are available at The National Map viewer (http://viewer.nationalmap.gov/viewer) or the USGS Store (http://store.usgs.gov). For additional information on US Topo, go to http://nationalmap.gov/ustopo.