Dr. Benjamin Rush gave what expeditionary group mercury laced laxatives which proved to be excellent tracers by which archaeologists have now been able to track their actual route?
Lewis and clark The Lewis and Clark Expedition Lewis and Clark Expedition Clark Expedition John Robertson (U.S. Soldier) Lewis and Clark's Corps of Discovery The corps of discovery The Corps of Discovery Lewis and Clark expedition Corps of Discovery Expedition Dates to lewis and clarks voyage Lewis & Clark Expedition Lewis and Clark's Expedition Silas Goodrich Lewis and Clark Lewis and Clark expedition in 1803 Louis and Clark Expidition Lewis & Clark Louis and Clark Expedition John Robertson (U.S. soldier) Hugh McNeal Lewis&Clark