Also, as the idea of the explorers about their trip to the Missouri river and recording measurements sounded strange to the Indians, so the promise of weapons and other artifacts kept them out of any suspicious behavior. All this encounters were recorded with footnote citations in journals carefully written so that all the information could be available in the future. There was also a set of questions previously prepared every time they meet a new tribe, trying to be as kindly as possible and avoiding questions about their religion or relationship with other tribes until they felt safe and comfortable to talk about those