Science: Mississippi in Mississippi

In rolling country near Jackson, Miss., 1,500 German prisoners of war were busy with pick & shovel. They heaped big mounds of earth, dug trenches and excavations that looked like foxholes. They were building perhaps the biggest topographical map ever made. When finished, it will be a mile-long concrete model of the Mississippi Valley, complete with tributaries, hills and mountains, stretching from Pittsburgh to Denver, from Minneapolis to New Orleans. Object: a laboratory to study flood control.

The $9,000,000 project, conceived by U.S. Army engineers, will be more than four times as big...

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