Ancient Mounds

 1908.

https://www.loc.gov/item/2013647011/

https://www.loc.gov/item/2003675053/

https://www.loc.gov/item/2016799037/

https://www.loc.gov/item/2012649012/

https://www.loc.gov/item/2018670902/

https://www.loc.gov/item/2017658693/

https://www.loc.gov/item/2014646019/

https://www.loc.gov/item/2018650521/

https://www.loc.gov/item/97505973/

https://www.loc.gov/item/2016797726/

https://www.loc.gov/item/2016797823/

https://www.loc.gov/item/2004679658/

https://www.loc.gov/item/2016794291/