The maps in the right side list are ranked by coverage, with the maps that have coverage closest to your search window listed at the top.Mousing over any map in the list will show the map's coverage as a light red rectangle on top of the Google Map.
The overlaid maps reveal changes over time and enable map analysis and discovery.
You can choose your own maps to georeference by Searching LUNA and using the Georeference This Map button or help us georeference the entire online map library using our Random Map link to georeference maps in our First Pilot Project of 6,000 maps of major cities and regions.
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Learn more The new Map Rank search tool enables geographical searching of the collection by map location and coverage, in a Google Map window.