1. Employment in manufacturing, 1982 : distribution by county Author/Creator: United States. Bureau of the Census. Geography Division Publication/Creation: [Washington, D.C.?] : Geography Division, [1985?] Resource Type: Map Access & Availability: Loading
2. Economic development districts, September 1, 1989 Author/Creator: United States. Economic Development Administration Publication/Creation: [Washington, D.C.?] : [The Administration], [1989] Resource Type: Map Access & Availability: Loading
3. Entwicklung und Struktur der Bevölkerung 1815 bis 1980 Author/Creator: Laux, Hans-Dieter Publication/Creation: Köln : Rheinland-Verlag, [1989] Resource Type: Map Access & Availability: Loading