This index is an interactive web map that shows the Sanborn maps of Allentown, Bethlehem, and Lehigh Valley, PA areas. Using this web map will help you select the correct volume and locate the sheet.
This index is an interactive web map that shows the Sanborn maps of Allentown, Bethlehem, and Lehigh Valley, PA areas. Using this web map will help you select the correct volume and locate the sheet.