| The 22 volumes of this series were
    published by Cupples & Leon. Some of them -- I've found four, so far --
    were also published as the "Second Motor Boys Series", with their
    own series order, and with slightly different titles: The Second Motor Boys Series: #1: NED, BOB, AND JERRY AT BOXWOOD HALL; OR, THE MOTOR BOYS AS
    FRESHMEN -- 1916. Cupples & Leon. #2: NED, BOB, AND JERRY ON A RANCH; OR, THE MOTOR BOYS AMONG THE
    COWBOYS -- 1917. Cupples & Leon. #3???: NED, BOB, AND JERRY IN THE ARMY; OR, THE MOTOR BOYS AS
    VOLUNTEERS -- 1919. Cupples & Leon. #4: NED, BOB AN JERRY ON THE FIRING LINE, OR, THE MOTOR BOYS FIGHTING
    FOR UNCLE SAM -- "During
    World War I, the Motor Boys are sent overseas to France where they uncover a
    spy plot." -- 1919. Cupples & Leon.   | 
    THE MOTOR BOYS; OR, CHUMS THROUGH THICK AND THIN -- 1906. Cupples
      & Leon. Read
      it online!
 
THE MOTOR BOYS OVERLAND; OR, A LONG TRIP FOR FUN AND FORTUNE --
      1906. Cupples & Leon. Read
      it online!
 
THE MOTOR BOYS IN MEXICO; OR, THE SECRET OF THE BURIED CITY --
      1906. Cupples & Leon.
 
THE MOTOR BOYS ACROSS THE PLAINS; OR, THE HERMIT OF LOST LAKE --
      1907. Cupples & Leon.
 
THE MOTOR BOYS AFLOAT; OR, THE STIRRING CRUISE OF THE DARTAWAY --
      1908. Cupples & Leon.
 
THE MOTOR BOYS ON THE ATLANTIC; OR, THE MYSTERY OF THE LIGHTHOUSE
      -- 1908. Cupples & Leon.
 
THE MOTOR BOYS IN STRANGE WATERS; OR, LOST IN A FLOATING FOREST
      -- 1909. Cupples & Leon.
 
THE MOTOR BOYS ON THE PACIFIC; OR, THE YOUNG DERELICT HUNTERS --
      1909. Cupples & Leon.
      Read it online!
 
THE MOTOR BOYS IN THE CLOUDS; OR, A TRIP FOR FAME AND FORTUNE --
      1910. Cupples & Leon.
 
THE MOTOR BOYS OVER THE ROCKIES; OR, A MYSTERY OF THE AIR --
      1911. Cupples & Leon.
 
THE MOTOR BOYS OVER THE OCEAN; OR, A MARVELOUS RESCUE IN MID-AIR
      -- 1911. Cupples & Leon.
 
THE MOTOR BOYS ON THE WING; OR, SEEKING THE AIRSHIP TREASURE --
      1912. Cupples & Leon.
 
THE MOTOR BOYS AFTER A FORTUNE; O R, THE HUT ON SNAKE ISLAND
      --1912. Cupples & Leon.
 
THE MOTOR BOYS ON THE BORDER; OR, SIXTY NUGGETS OF GOLD -- 1913.
      Cupples & Leon.
 
THE MOTOR BOYS UNDER THE SEA; OR, FROM AIRSHIP TO SUBMARINE --
      1914. Cupples & Leon.
 
THE MOTOR BOYS ON ROAD AND RIVER; OR, RACING TO SAVE A LIFE --
      1915. Cupples & Leon.
 
THE MOTOR BOYS AT BOXWOOD HALL; OR, NED, BOB AND JERRY AS FRESHMEN
      -- 1916. Cupples & Leon.
 
THE MOTOR BOYS ON A RANCH; OR, NED, BOB, AND JERRY AMONG THE COWBOYS
      -- 1917. Cupples & Leon.
 
THE MOTOR BOYS IN THE ARMY; OR, NED, BOB, AND JERRY AS VOLUNTEERS.
      1918. Cupples & Leon.
 
THE MOTOR BOYS ON THE FIRING LINE; OR, NED, BOB, AND JERRY FIGHTING
      FOR UNCLE SAM -- 1919. Cupples & Leon.
 
THE MOTOR BOAT BOYS BOUND FOR HOME; OR, NED, BOB, AND JERRY ON THE
      WRECKED TROOPSHIP. 1920. Cupples & Leon.
 
THE MOTOR BOAT BOYS ON THUNDER MOUNTAIN; OR, THE TREASURE CHEST OF
      BLUE ROCK -- 1924. Cupples & Leon.  
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