greyscale non-ortho-rectified vertical aerial photography covering portions of Milwaukee County - believed to have been captured in 1928 - resolution is approx. 8 inches per pixel - sheets covering approx. 1/2 mile by 1/2 mile were scanned and georeferenced via third-order polynomial transformation using high-resolution orthography as reference
Milwaukee County GIS & Land Information (2016). Aerial Photo [Wisconsin--Milwaukee County] {1928}. Milwaukee County GIS Download. https://gis-mclio.opendata.arcgis.com/datasets/MCLIO::1928-aerial-photo (imagery)