My Dear Boys: This volume is a complete story in itself, but forms the seventeenth in a line issued under the general title of "The Rover Boys Series for Young Americans." As I have mentioned several times, in other volumes, this line was started with the publication of "The Rover Boys at School," "On the Ocean" and "In the Jungle." The cordial reception afforded the stories called for the publication of the next volume, "The Rover Boys Out West," and then, year after year, by the issuing of "On the Great Lakes," "In Camp," "On Land and Sea," "On the River," "On the Plains," "In Southern Waters," "On the Farm," "On Treasure Isle," "At College," "Down East," and then by "In the Air," where w…
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