I helped researchers at the Fed and Colby College with a project that involved many different GIS tasks. I helped them by digitizing a 1921 zoning map and spatially joining the historical zones with a modern dataset. In addition, I built them an historical address locator, using historical street networks for 1900, 1915, and 1930 that I developed by taking current centerline data and adding/editing segments to reflect their existence and name for the three aforementioned years. I sued Sanborn maps and other historical sources to both draw historical streets which no longer exist and to add historical “to” and “from” addresses for all street segments for 1900, 1915, and 1930.