Good old usgs topographic maps are copyright free:
http://nationalmap.gov/ustopo/faq.html
And often a very useful reference when mapping, particularly in remote
areas.
I am aware of:
http://toposm.com/us/
But is there a way to get USGS topographic slippymaps as a background in
JSOM?
I've completed the import outside the Tampa area.
I noticed when working on it that it seems to not include recent
changes. So it's as if someone surveyed the roads for OSM several years ago.
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The USTopo products are not the good old 1:24K. Rather, they are GeoPDFs
generated out of The National Map layers (with one exception).
You can get the classic scanned topos (Digital Raster Graphics, DRGs) via
WMS:
[drg]
type=WMS
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