"Travels through the western interior of the United States, from the year 1808 up to the year 1816: with a particular description of a great part of Mexico, or New-Spain. Containing a particular account of thirteen different tribes of Indians through which the author passed, describing their manners, customs, &c., with some account of a tribe whose customs are similar to those of the ancient Welsh."
Clark writes his brother Jonathan from Big Bone Lick, Kentucky, while conducting a major archaeological fossil dig at Thomas Jefferson's request. He describes what has been unearthed so far and mentions their brother George Rogers Clark being drunk but "more thoughtfull to day."