Scale approximately 1:700,000 (W 80°31ʹ00ʺ--W 74°41ʹ00ʺ/N 42°17ʹ00ʺ--N 39°43ʹ00ʺ).
Note
"This map to be used with 1950 Census data." Inset map: Pennsylvania counties by per cent of families with annual incomes of over $10,000 in 1949. "Neg. 25234 - A."