• Map
    Water-resources investigations in Iowa, 1978 / Catalog Record Only Panel title. Includes text and tables. Includes bibliographies.
    • Contributor: Geological Survey (U.S.)
    • Date: 1979
  • Map
    Hydrologic unit map--1974, State of Iowa. Catalog Record Only Scale 1:500,000; 1 in. equals approx. 8 miles. Relief shown by spot heights. "Lambert conformal conic projection based on standard parallels 33⁰ and 45⁰." "Base map drainage modified in 1974." Base map "Compiled in 1965. Edition of 1966." Includes text and table of hydrologic units. AACR2
    • Contributor: Geological Survey (U.S.)
    • Date: 1976