Pictured! 1 3/4" Triangular Knife - nicely ground lower edges and incurvation. Eastern South Dakota.

1 3/4" Triangular Knife with nicely ground lower edges and incurvation. Found in Eastern South Dakota. From the collection of the late Harlan Olson. Published in Indian Artifact Magazine “Early Migration – East or West?” by Harlan Olson February 2001 page 20. Harlan Olson personal find 1999.