greyscale non-ortho-rectified vertical aerial photography covering Milwaukee County Wisconsin; captured April 1967; resolution of approx. 11 inches per pixel; source 9 inch x 9 inch 1:20,000 prints were scanned at 1,800 pixels per inch and georeferenced via third-order polynomial transformation using ortho-rectified imagery as reference This dataset was automatically cataloged from the creator's Open Data Portal. In some cases, publication year and bounding coordinates shown here may be incorrect. Additional download formats may be available on the author's website. Please check the 'More details at' link for additional information.