19th century 1 Air pilots 1 Degeneration 1 Diamond mines and mining 1 English language 1 English literature 1 Europeans 1 more ... History 1 Imperialism 1 Missing persons 1 Quatermain, Allan (Fictitious character) 1 Trading posts 1 Translating into Spanish 1 Treasure troves 1 Women air pilots 1 less ...