In 1882, field geologists from the Lake Superior Division of the US Geological Survey (USGS) began meticulously mapping, collecting samples, and taking inventory of the geology and mineral resources of the Lake Superior region. This survey was completed in 1922, and today the data collected during those four decades of research can be found in the Lake Superior Legacy Collection. Here, visitors will find scanned images of the division geologists' field notebooks and hand-drawn maps, as well as photographs of rock samples (both hand samples and thin sections with accompanying metadata) collected during their survey. This digital collection also features an interactive map where viewers can browse the data based on where it was originally collected, with locations spanning parts of Minnesota, Wisconsin, Michigan, and Ontario. In addition to the collection's importance to geologists, it may also be of particular interest to historians and geographers. The Lake Superior Legacy Collection was created by the Wisconsin Geological and Natural History Survey in partnership with the University of Wisconsin Digital Collections. It was funded by the USGS National Geological and Geophysical Data Preservation Program.