1. Water type and concentration of dissolved solids, chloride, and sulfate in water from the Ozark aquifer in Missouri, Arkansas, Kansas, and Oklahoma Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, Va. : The Survey, 1991 Resource Type: Map Access & Availability: Loading
2. Wetlands of modern and ancestral lakes Erie and St. Clair, Michigan, Ohio, Indiana, Pennsylvania, and New York, U.S.A., and Ontario, Canada Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
3. Die Wirtschaft um 1925 : Erwerbstätige nach Wirtschaftsbereichen Author/Creator: Zunkel, Friedrich, 1925- Publication/Creation: Köln : Rheinland-Verlag, [1992] Resource Type: Map Access & Availability: Loading