The document summarizes the evolution of soil surveys from early county-level datasets to the current approach of grouping soils by Major Land Resource Area (MLRA) to provide more consistent interpretations across political boundaries. It describes how early soil surveys were mapped by hand and have now been digitized. Recent efforts have focused on harmonizing data across survey areas and evaluating soils based on their intended map unit concept rather than boundaries. This allows for editing and updating soil data in software like ArcGIS. All tabular data is now hosted in a national database to integrate spatial and non-spatial soil data. The goal is to continue building upon the work of previous soil scientists.