| The Pony Rider Boys in the Rockies; Or, The Secret of the Lost Claim |
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| The Pony Rider Boys in Montana; Or, The Mystery of the Old Custer Trail |
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| The Pony Rider Boys in the Ozarks; Or, The Secret of Ruby Mountain |
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| The Pony Rider Boys in New Mexico; Or, The End of the Silver Trail |
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