This government document is issued by State Historical Society for use in South Dakota
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https://www.google.com/url?client=internal-element-cse&cx=012382400048732927914:mevu_vgo-ww&q=https://history.sd.gov/archaeology/docs/using%2520Google%2520Earth%2520for%2520site%2520forms.pdf&sa=U&ved=2ahUKEwikyKvnx8iFAxU-_rsIHcucDFk4ChAWegQIBxAB&usg=AOvVaw1tePcKzWL-0Vvyh72KV91K&arm=e