His valuable notes on Native American dialects are in The Transactions of the American Philosophical Society (1862) in The American Journal of Science (1862) and in The Proceedings of the American Philosophical Society (1869).
Seine wertvollen Notizen über die Dialekte der US-Indianer erschienen in The Transactions of the American Philosophical Society (1862), in The American Journal of Science (1862) und in The Proceedings of the American Philosophical Society (1869).