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Dana Estes & Company
Continues the story of Carroll Morse, Sumner Parker, and Val Brandon and the two mysterious ciphers and the adventures in which the boys were involved on account of them.
Adventure stories, Code and cipher stories, Boats and boating, Juvenile fiction
Children's Literature Collection
McAllister, Earle C. and Kennedy, J.W. Ferguson, "An Island Secret" (1909). Children's Literature Books. 14.