Take a look at change-set 4176402, http://www.openstreetmap.org/node/670188926

Someone inserted the French triangulation points into OSM;  these date back to 
pre-1914 and can be used to geo-reference German and French maps.

Tim, at some point we should add a 'snapping' feature to map warper so we can 
simply pick (man_made=survey_point) points for geo-referencing.

-rhw


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