Data

Mill dams located from historical maps and atlases

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online maps

• Baltimore County, MD
• Montgomery County, MD
• Centre County, PA
• Chester County, PA
• Cumberland County, PA
• Huntingdon County, PA
• Lancaster County, PA
• York County, PA

csv download: dams-from-historical-atlases.zip

 

US Census 1840 - Manufacturing

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online maps

• Mill density

csv download: us-census-1840-manufacturing.zip