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- Adventure stories[remove]9
- Adventure and adventurers7
- Boys7
- Radio2
- Telegraph, Wireless2
- Treasure troves2
- Deep diving1
- Explosives1
- Extinct cities1
- Flight1
- Gliders (Aeronautics)1
- Gliding and soaring1
- Incas1
- Indians of Central America1
- Mayas1
- Oil wells1
- Petroleum industry and trade1
- Pirates1
- Science fiction1
- Submarines (Ships)1