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The sons of the sword, or, The watchers from the Rhine / by Richard R. Montgomery
The boy messenger of Russia, or, The Czar's secret despatch bearer / by Allan Arnold
Loyal to the last, or, Fighting for the Stars and Stripes
The spy of Spuyten Duyvil, or, The boy with a charmed life
The iron grays, or, The boy riders of the Rapidan
The blue mask, or, Fighting against the Czar
Twenty boy spies, or, The secret band of Dismal Hollow
The brand of Siberia, or, The boy tracker of the Steppes
unsolved mystery, or, Nick Carter's government case
Mignon Duprez, the female spy, or, Patsy's fight for Adelina
Plotters against a nation, or, The mystery of the perfumed handkerchief
An international conspiracy, or, Nick Carter's second assistant in a new field
The great spy system, or, Nick Carter's promise to the president
White House mystery, or, Nick Carter's case for the president
The brotherhood of Free Russia, or, Nick Carter's beautiful friend Olga
The nihilist's second move, or, Nick Carter's timely interference
A queen of vengeance, or, Nick Carter's beautiful nemesis