I have 3 stone tools my Dad found in the 60's digging out by our barn. Lots of arrowheads were found (don't know what happened to them though). We lived on an island called Puget Island in the Columbia River in SW Washington - Cathlamet, WA is the town connected by bridge. Native American tribe that inhabited the area were knocked out by small pox (I think). What are they? What were they used for? If I wanted to sell them, where or who would I go through? Thank you for your help.