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The Office of Public Affairs (OPA) wishes to thank Thomas Allen for his work in drafting and preparing this publication. OPA also expresses its gratitude to those who gave of their time and expertise in reviewing Mr. Allen’s draft. Most of the photographs came from the Library of Congress in Washington, D.C., and the National Archives and Record Administration in College Park, Maryland. The Harper’s Weekly drawings of “The Scout,” “The CSS Alabama,” “Life of a Spy,” “Arson Gossip Article,” “Arson Story,” “Guardhouse at Langley,” and “Ft. Sumter article” were courtesy of Harpweek, LLC. The pictures of the “Cipher for Telegraphic Correspondence Code Book,” the “Cipher Cylinder,” and the “Star Wig-Wag Flag” are courtesy of the National Security Agency. The photo of Elizabeth Van Lew is from the Virginia Historical Society. The Confederate flags are from the Museum of the Confederacy.