Click on the America History and Life link below
Enter the term Shawnee Tribe in the first search box
Enter the term Ohio in the second search box
Scroll down the page until you see Historical Period in the right column
In the first Year box, enter 1800 and ERA a.d.
In the second Year box, enter 1820 and ERA a.d.
Under Publication Type, select Academic Journal
Hit the Search key, and see your results.
Keep in mind --- not everything in this database is full text.