Turning to the classics, many of which can be found in the Mobileread library, others at Project Gutenberg:
*
Jules Verne, adventure and science fiction
**
20,000 Leagues Under the Sea
**
A Journey to the Center of the Earth
**
All Around the Moon
**
An Antarctic Mystery
**
Around the World in 80 Days
**
Dick Sand: Captain at 15
**
Eight Hundred Leagues on the Amazon
**
Five Weeks in a Balloon
**
From the Earth to the Moon
**
In Search of the Castaways
**
Journey to the Center of the Earth
**
The Mysterious Isand
*
Victor Appleton, adventure
**
Moving Picture Boys Omnibus
**
Tom Swift Omnibus, Volume 1, and 4 more volumes
*
Thomas Bullfinch, legends and folk tales
**
Bullfinch's Mythology (or The Age of Fable)
**
Legends of Charlemagne
**
The Age of Chivalry
*
Arthur Ransome, folk tales
**
Old Peter's Russian Tales
*
Edward Stratemeyer, adventure
**
Rover Boys Omnibus, Volume 1, and 4 more volumes
*
Frank Patchin, adventure
**
The Pony Rider Boys in the Rockies, 11 other episodes in the Mobileread library
*
H Irving Hancock, adventure
**
Grammar School Boys Omnibus
**
High School Boys Omnibus
**
High School Boys Vacation Omnibus
** and the same boys are then found in the Annapolis Omnibus, West Point Omnibus, Young Engineers Omnibus, and Dave Darren Omnibus.
*
H Rider Haggard, action and adventure, science fiction/fantasy
**
Haggard Omnibus, Volume 1, 15 more volumes