The Discovery of the Oregon Trail: Robert Stuart's Narratives of His ... - Robert Stuart - Google Books

https://books.google.de/books?id=iefDlnjDeQgC&pg=PA17&dq=John+Whetten+Ehninger&hl=de&sa=X&ei=VSTzVJmfNs3zasKtgIgI&ved=0CC0QuwUwA

"A major contribution to Americana. . . . Not only has Mr. Rollins brought to light one of the most important and absorbing records of early Western exploration but . . . he has also presented an example of American historical research at its best.…