Introductory material
Reading edition
CHAPTERS I. The Two Wolf Patrol Boys II. A Camp Supper III. The Mysterious Explosion IV. Reading a "Sign" by Torchlight V. The "Fool-Proof" Aeroplane VI. A Red Letter Day in the Woods VII. Bud's Meteor VIII. Uncle Sam's Flying Squadron IX. Friends in Khaki X. Up in a War Monoplane XI. Good-By to the Foreign Spies XII. Home Again