Do you know of first hand accounts of this - I don't think there are very many? Other than the papers that I mentioned, my main source on this is the only one of Stefansson's books that I have read:
Stefansson, V. (1960) Cancer: Disease of civilization? An anthropological and historical study. Hill and Wang.
This is a truly fascinating book, and although the Inuit diet isn't it's main subject, he does talk a bit about it. His estimate is that at least 98% of these people's energy was obtained from meat and fish - with the other 2% being highly seasonal. He based this partly on his own experiences (gained on a series of expeditions to northern parts of Canada and Alaska between 1904 and 1916) , and partly on accounts given by others. In particular he cites August Krogh (who visited northern Greenland in 1902), John Murdoch (who lived amongst the people of Northern Alaska from 1881 to 1883), Joseph Romig (a missionary/doctor who visited the Berring Sea in 1896) and Samuel Hutton (a doctor who lived on the Labrador Peninsula from 1902-1913). Stefansson does point out various regional differences in diet, but nonetheless he claims that all of these authorities share his view that the traditional Inuit diet was extremely low in carbohydrate, and that these people lived on it with no apparent ill effects.
If you know of other first hand accounts from this period that disagree with this view, then please post them - I find this whole area extremely interesting.