livre (2) monde (1) puits (1) temps (durée) (1) surveillance (1) science (1) recherche (1) politique (1) histoire (1) règlement (1) sentier (1) Travel (1) History (1) Implements (1) Texts (1) Texts (1) Humor (1) Texts (1) Voyages around the world (1) Voyages and travels (1) Tools (1) Time (1) Scientific expeditions (1) Science (1) Satire (1) Research (1) Reading (1) Politics, Practical (1) Political science (1) Overland journeys to the Pacific (1)