Description Format Author(s) Source
List of five data frames, one for each Great Lake (Superior, Michigan, Huron, Erie, Ontario) with longitude and latitude coordinates of the shorelines.
One row for each point, consecutive rows with non-missing values for each line.
Rich Signell, USGS.
NOAA National Geophysical Data Center, (the now defunct) Coastline Extractor, ngdc.noaa.gov/mgg/coast.
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