Hydrologic unit map--1974, State of Mississippi.
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 1974." Base map "Compiled in 1971. Edition of 1972." Includes text and indexed table of hydrologic units. Available also through the Library of Congress Web site as a raster image. AACR2
Geological Survey (U.S.) - Water Resources Council (U.S.)