Contract entered into under the authority of the United States, between governor Thomas Posey, superintendent of Indian affairs, and Chekommia or Big River, principal chief of the Piankeshaws--
"Treaty Number: NAM000397." Treaty date: 1/3/1818. Extracted from: United States. Indian affairs : laws and treaties / compiled and edited by Charles J. Kappler. Washington : Government Printing Office, 1903-1971.