[OSM-talk] USGS Topo maps

[Phil Endecott]

Taru Ani wrote:
> USGS topo maps are in the public domain (
> http://www.usgs.gov/laws/info_policies.html), but must give credit to the
> USGS.

Not, you don't have to acknowledge them; they can be used without 
restriction.  (If you did, they wouldn't be "public domain".)  However, 
they do encourage you to give an acknowledgement.  What they actually 
say is here:

     http://www.usgs.gov/visual-id/credit_usgs.html


Regards,  Phil.