Motor Camping
The Motor Boys Under the Sea; or, From Airship to Submarine
The Motor Boys Overland; Or, A Long Trip for Fun and Fortune
The Motor Boys on the Wing; Or, Seeking the Airship Treasure
The Motor Boys on the Pacific; Or, the Young Derelict Hunters
The Motor Boys on the Border; Or, Sixty Nuggets of Gold
The Motor Boys in Mexico; Or, The Secret of the Buried City
The Motor Boys After a Fortune; or, The Hut on Snake Island
The Motor Boys Across the Plains; or, The Hermit of Lost Lake
The Motor Boat Club in Florida; or, Laying the Ghost of Alligator Swamp
The Motor Boat Club and The Wireless; Or, the Dot, Dash and Dare Cruise
Motor Boat Boys Mississippi Cruise; or, The Dash for Dixie
Motor Boat Boys Down the Coast; or, Through Storm and Stress to Florida
The Motley Muse (Rhymes for the Times)
Moths of the Limberlost: A Book About Limberlost Cabin
The Moths of the British Isles, Second Series