Don't know if your aware of this or not, but in Shannon Co.,MO, within the boundaries of the "Ozark National Riverways" there is a place called "Akers Ferry" on the Current River. This site was occupied from around 1830-1860. The National Park Service has conducted archeological projects there to collect both historical and pre-historic data. Copies of the NPS reports are available through the Midwest Archeological Center, Lincoln, NE. Not sure if the folks who operated this ferry are related to the ones your investigating or not.