Editor Paul Lagassé
Senior Editors Lora Goldman Archie Hobson Susan R. Norton
Associate Editors Barry J. Katzen Alan D. Levy Theodore Zinn
Contributors Curt Bertschi Helen…
Source: U.S. Dept. of the Interior, Geological Survey According to the theory of continental drift, the world was made up of a single continent through most of geologic time. That continent…
CANNON, Joseph Gurney, a Representative from Illinois; born in Guilford, Guilford County, N.C., May 7, 1836; moved with his parents to Bloomingdale, Ind., in 1840; completed preparatory…
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