Books by Wrenn, Charles L. (Charles Lewis) (sorted alphabetically)
- Great Oakdale Mystery Morgan Scott
- Great Sioux Trail: A Story of Mountain and Plain Joseph A. Altsheler
- Guns of Europe Joseph A. Altsheler
- Hosts of the Air Joseph A. Altsheler
- In the Heart of the Christmas Pines Leona Dalrymple
- Lefty Locke, pitcher-manager Burt L. Standish
- Lucia Rudini: Somewhere in Italy Martha Trent
- Molly Brown's College Friends Nell Speed
- Molly Brown's Freshman Days Nell Speed
- Molly Brown's Junior Days Nell Speed
- Molly Brown's Orchard Home Nell Speed
- Molly Brown's Post-Graduate Days Nell Speed
- Molly Brown's Senior Days Nell Speed
- Molly Brown's Sophomore Days Nell Speed
- Motor Maids by Rose, Shamrock and Thistle Katherine Stokes
- Motor Rangers' Cloud Cruiser John Henry Goldfrap
- Motor Rangers' Wireless Station John Henry Goldfrap
- moving finger Natalie Sumner Lincoln
- Ocean Wireless Boys and the Lost Liner John Henry Goldfrap
- Ocean Wireless Boys and the Naval Code John Henry Goldfrap
- ocean wireless boys of the iceberg patrol John Henry Goldfrap
- Ocean Wireless Boys on the Atlantic John Henry Goldfrap
- Polly's First Year at Boarding School Dorothy Whitehill
- Polly's Senior Year at Boarding School Dorothy Whitehill
- Rex Kingdon on Storm Island Gordon Braddock