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 * "The Rover Boys on the Plains" is a complete story in itself, but forms the tenth volume of a line known under the general title of "The Rover Boys' Series for Young Americans."

Ten volumes make a great number, and, as I look back, I wonder how I have been able to write so many. As I have said before, when I started this series I had in mind to pen three volumes and possibly a fourth. But no sooner had "The Rover Boys at School," "The Rover Boys on the Ocean," "The Rover Boys in the Jungle" and "The Rover Boys Out West" appeared than there was a demand for another volume, and then more, and so I have had to take the boys from time to time, "On the Great Lakes," "In the Mountains," "On Land and Sea," "In Camp" and "On the River," where we last left them.

The present tale tells of adventures on the mighty Mississippi River, and then on the great plains, where Dick, Tom and Sam, and some of their friends, have a variety of adventures and assist in unraveling the mystery surrounding a