The site contains diaries, narratives, and letters of the Mountain Men. "These documents are accounts of the Rocky Mountain fur trade during the first half of the 19th century. Most of these are either primary or secondary historical sources; that is, either written by, or as told by those who were actually there. These documents have been transcribed from printed or manuscript form. The resulting text files have been manually checked and edited to conform to the original source. In most cases, any spelling or grammatical errors from the original have been retained."