Found it here while checking out a nearby earthquake I was notified about... http://earthquake.usgs.gov/earthquakes/eventpage/usb000tiqz#general_map
The "Street" layer of the map is very clearly taking tiles from Mapquest Open (spotted at relatively low zoom over tulsa due to Mapquest lagging months behind on that zoom over parts of I 244 and I 44 which were tagged during major construction operations as recently as last fall in a manner that which that renderer didn't understand, leaving gaps over the Arkansas River on 244 and Midtown Tulsa near Lewis Avenue on I 44); confirmed by zooming in deeper around the BOK Center in downtown Tulsa with a pretty high level of detail of the block the arena is on itself along with a number of city sidewalks from changesets I uploaded in the last week). "Legal" page is 404. "About Us" doesn't seem to mention anything either. No attribution on map itself. Only the "Street" layer appears to be from OSM data.
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