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(ISSN 1541-3357) is published seven times during the school year—September, October, November– December, January–February, March, April, May—by National Geographic Society, 1145 17th Street NW, Washington, D.C. 20036. Postmaster: Please send address changes to Attn: Explorer Magazine, National Geographic Society, PO Box 291875, Kettering, OH 45429. Periodical postage paid at Washington, D.C., and additional mailing offices.
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