| In the Riding-School; Chats with Esmeralda
Miss G. Hamlin | |
| In the Roar of the Sea
S. Baring-Gould | |
| In the Roaring Fifties
Edward Dyson | |
| In the Rocky Mountains
William Henry Giles Kingston | |
| In the Rocky Mountains: A Tale of Adventure
William Henry Giles Kingston | |
| In the Royal Naval Air Service / Being the war letters of the late Harold Rosher to his family
Harold Rosher | |
| In the Russian Ranks: A Soldier's Account of the Fighting in Poland
John Morse | |
| In the Saddle
Oliver Optic | |
| In the Saddle: A Collection of Poems on Horseback-Riding
Various | |
| In the Sargasso Sea / A Novel
Thomas A. Janvier |
