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- AIRPLANE BOYS ON THE BORDERLINE (Also published as Skylarking Comrades Series #1, "The Borderline Mystery" under the M. Delmore Marquith pseudonym, and
previously published as Sky Buddies Series #1, "The Air Mystery of Isle La Motte) -- 1930. World Syndicate.
- AIRPLANE BOYS AT CAP ROCK -- (Also published as Skylarking Comrades Series #2, "Flying Buddies of Texas" using the
pseudonym M. Delmore Marquith, and previously published as Sky Buddies Series #2, "Cap Rock Flyers.") -- 1930. World Syndicate.
- AIRPLANE BOYS DISCOVER THE SECRET OF CUZCO (Also published as #3 in the Skylarking Comrades series, "Flying in Southern Wilderness," and
previously published as #3 in the Sky Buddies series, "Sky Buddies' Secret of
Cuzco.") -- 1930. World Syndicate.
- AIRPLANE BOYS FLYING TO AMY-RAN FASTNESS (Previously published as Sky Buddies Series #4, "Flying to Amy-Ran Fastness," and
also published as Skylarking Comrades Series #4, "Emerald Temple Air Mystery," with the author given as M. Delmore Marquith for the latter.) -- 1930. World Syndicate.
- AIRPLANE BOYS AT PLATINUM RIVER -- 1931. World Syndicate.
- AIRPLANE BOYS WITH THE REVOLUTIONISTS IN BOLIVIA -- 1931. World Syndicate.
- AIRPLANE BOYS IN THE BLACK WOODS -- 1932. World Syndicate.
- AIRPLANE BOYS AT BELIZE -- "The Flying Buddies are battered by a hurricane and captured between two criminal gangs in British
Honduras." -- 1932. World Syndicate.
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