This site is still under construction and a bit fragmented. Please be patient!
A Volume Summary page aggregates all sheets from a Sanborn map edition (or volume) for an overview of georeferencing progress.
Sanborn map sheets contain extensive information about every building at a very large scale (1:100 or 1:200).
Users will georeference map sheets one-by-one, eventually creating a continuous mosaic out of the volume.
Explore the Mosaics
The mosaics can be used in web maps, as below, to provide a window to what American cities looked like at the turn of the 20th century.