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Dick Merriwell, diplomat, or, The stolen state paper
Dick Merriwell, triumphant, or, The great secret
Frank Merriwell in Paris, or, The man without a name
Texan spy, or, The prairie guide
Nadia, the Russian spy
Eph, the mimic spy, or, The Frenchman's doom
Iron-Nerve Despard, or, The man of many disguises
specter spy, or, The wizard canoe