@article{annals-of-iowa 14030, author = {O. E. Klingaman}, title = {The Upper Mississippi in 1840}, volume = {29}, year = {1948}, url = {https://pubs.lib.uiowa.edu/annals-of-iowa/article/id/14030/}, issue = {3}, doi = {10.17077/0003-4827.6600}, abstract = {}, month = {1}, pages = {176-196}, issn = {2473-9006}, publisher={State Historical Society of Iowa}, journal = {The Annals of Iowa} }