Topographic quadrangle maps of alluvial valley of lower Mississippi River. Missouri, Poplar Bluff quadrangle, lat. 36°45′-37°, long. 90°15′-90°30′. Scale 1:62,500, contour Intervals 5 ft and 20 ft. Edition of 1939, Wappapello Reservoir added July 1941, by Mississippi River Commission, revised Jan. 1949.